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Lead-acid batteries and lead-liquid flow batteries
The lead–acid cell can be demonstrated using sheet lead plates for the two electrodes. However, such a construction produces only around one ampere for roughly postcard-sized plates, and for only a few minutes. Gaston Planté found a way to provide a much larger effective surface area. In Planté's design, the positive and negative plates were formed of two spirals o.
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Can flow batteries be shipped by sea
Swollen, leaking, or recalled batteries are strictly prohibited for air transport but may be approved for ocean (on a case-by-case basis). Requirements evolve frequently. This guide explains the process simply and. However, shipping lithium batteries or battery-powered devices across oceans involves far more than just loading containers and sending them off. Lithium batteries are classified as dangerous goods because they have the potential to overheat, catch fire, or even explode if mishandled. So how do you know when you can ship lithium batteries in an ocean container? From toothbrushes to Teslas, lithium batteries power countless items that support. Lithium batteries need to be shipped with care to avoid issues like delays or rejected cargo. Due to their potential fire risk, they are considered dangerous goods and must follow international rules for packaging, labelling, documentation, and approvals. This guide provides scenario-based situations that outline the applicable requirements that a shipper.
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Advantages and disadvantages of all-aluminum flow batteries
Discover what flow batteries are and how they're transforming large-scale energy storage. Aluminum battery energy storage is emerging as a promising alternative to traditional lithium-ion systems. This article explores its advantages, limitations, and real-world applications in renewable energy integration, industrial power management, and electric vehicles. Aluminium can exchange three electrons per ion. The evolution of Al-ion batteries can be traced back to the early 2000s when researchers began. Flow batteries offer longevity and safety, while lithium-ion batteries provide power in a compact package.
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What wires should be used to connect high current batteries
A battery bank for an Off-Grid solar powered alternative energy system will consist of a number of batteries and their interconnecting terminal cables. The batteries will be connected together in various series-parallel configurations depending on your schematic design to achieve a desired voltage and capacity to work. How big should the cables be? First you will need to calculate the maximum current that could flow through the various interconnecting cables. The following maximumamps versus cable size (AWG) come from the NEC version 2011. As far as I know these values are valid as of today. For more detail though, check with the National. Eventually I decided to do-it-yourself for making heavy duty cables for my battery bank. I purchased bulk cable (just pick your size). And a heavy duty cable crimper (and the associated wire.
FAQs about What wires should be used to connect high current batteries
How to choose a battery cable?
Choosing the correct size (diameter) and length of cable is important for overall e ciency. Cables that are too small or unnecessarily long will result in power loss and increased resistance. When connecting batteries in series, parallel or series/parallel the cables between each battery should be of equal length.
What size battery cable do I Need?
The battery cable size you need depends largely on the specific application requirements and current capacity. And the size is usually represented by AWG, which indicates the cross-sectional area. When determining the battery cable size, you should consider the following factors:
Should a battery be wired together?
Wiring multiple batteries together as one big bank, rather than having individual banks makes them more e cient and ensures maximum service life. Wiring batteries together in series will increase the voltage while keeping the amp hour capacity the same.
How do I choose the right battery cable thickness?
There are ways to help you with selecting the correct cable thickness: Look in the product manual. The rule of thumb. Recommended battery cables table. All our manuals recommend the DC battery cable size (and fuse size) that needs to be used for the product. The Victron app helps you calculate cable size and voltage drop.
How to connect a battery in a series?
When connecting batteries in series, parallel or series/parallel the cables between each battery should be of equal length. As you can see in the diagrams below all the short cables connecting the batteries together are the same length and all the long cables are the same length.
Why are battery cables important?
The importance of batteries is self-evident, but people often overlook the role of battery cables. Whether in vehicles or other applications, they all require battery cables to transfer the power from the battery to connected devices.
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What welding method should be used for household batteries
Applying the right technology for welding batteriesWelding Tabs and Buss Bars To Terminals To join cells into a battery pack, the cell terminals are welded together in serial or parallel to achieve either a higher voltage, higher capacity, or both.
FAQs about What welding method should be used for household batteries
Which welding techniques can be used for connecting battery cells?
Brass (CuZn37) test samples are used for the quantitative comparison of the welding techniques, as this metal can be processed by all three welding techniques. At the end of the presented work, the suitability of resistance spot, ultrasonic and laser beam welding for connecting battery cells is evaluated.
Which welding method is best suited to a battery pack?
In this article, we will discuss multiple welding methods from resistance welding to laser welding technologies and see when one is better suited over another. To join cells into a battery pack, the cell terminals are welded together in serial or parallel to achieve either a higher voltage, higher capacity, or both.
What are the different battery welding technologies?
Common battery welding technologys are: ultrasonic welding, resistance spot welding, laser welding, pulse TIG welding. This post combines the application results of the above battery welding technologies in lithium-ion battery systems, and explores the influencing factors. Ultrasonic welding is a solid state battery welding process.
How do you Weld a battery?
The search was then performed using Uppsala University's Library database and Google scholar which cover a wide range of articles and sources. Three methods for welding batteries were given in the template, being laser beam-, ultrasonic-, and resistance spot welding.
What welding technology is used in lithium ion battery system?
Since the lithium-ion battery system is composed of many unit cells, modules, etc., it involves a lot of battery welding technology. Common battery welding technologys are: ultrasonic welding, resistance spot welding, laser welding, pulse TIG welding.
What to consider when welding a battery pack?
The most crucial aspect to consider when welding a battery pack is the contact resistance between the cell and the connection tab or a buss bar. This variable needs to be minimized to prevent unnecessary energy loss in the form of heat generation.
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What materials are inside lead-acid batteries
Lead–acid batteries lose the ability to accept a charge when discharged for too long due to sulfation, the crystallization of. They generate electricity through a double sulfate chemical reaction. Lead and lead dioxide, the active materials on the battery's plates, react with in the electrolyte to form. The lead sulfate first forms in a finely divided, state and easily reverts to lead, lead dioxide, and sulfuric acid when the battery rech.
FAQs about What materials are inside lead-acid batteries
What are the components of a lead acid battery?
In summary, lead acid batteries are composed of lead dioxide, sponge lead, sulfuric acid, water, separators, and a casing. Each material contributes to the overall performance and safety of the battery system. How Does Lead Contribute to the Function of a Lead Acid Battery?
What is the construction of a lead acid battery cell?
The construction of a lead acid battery cell is as shown in Fig. 1. It consists of the following parts : Anode or positive terminal (or plate). Cathode or negative terminal (or plate). Electrolyte. Separators. Anode or positive terminal (or plate): The positive plates are also called as anode. The material used for it is lead peroxide (PbO 2).
Which materials contribute to the rechargeable nature and efficacy of lead acid batteries?
The materials listed above contribute significantly to the rechargeable nature and efficacy of lead acid batteries. Lead Dioxide (PbO2): Lead dioxide is the positive plate material in lead acid batteries. It undergoes a chemical reaction during the charging and discharging processes.
What are the parts of a lead-acid battery?
A lead-acid battery has three main parts: the negative electrode (anode) made of lead, the positive electrode (cathode) made of lead dioxide, and an electrolyte of aqueous sulfuric acid. The electrolyte helps transport charge between the electrodes during charging and discharging.
How does lead contribute to the function of a lead acid battery?
Lead contributes to the function of a lead acid battery by serving as a key component in the battery's electrodes. The battery contains two types of electrodes: the positive electrode, which is made of lead dioxide (PbO2), and the negative electrode, which consists of sponge lead (Pb).
What is a lead-acid battery?
It consists of lead dioxide (PbO2) as the positive plate, sponge lead (Pb) as the negative plate, and an electrolyte solution of sulfuric acid (H2SO4). The United States Department of Energy defines a lead-acid battery as “a type of rechargeable battery that uses lead and lead oxide as its electrodes and sulfuric acid as an electrolyte.”
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Companies that produce lithium batteries using battery cells
The top 10 lithium-ion battery manufacturers in the world in 2024 includes:CATL (Contemporary Amperex Technology Co., Limited)LG Energy Solution, Ltd. Panasonic CorporationSAMSUNG SDI Co.
FAQs about Companies that produce lithium batteries using battery cells
Who makes lithium ion batteries?
Their lithium-ion batteries are used by more than 600,000 electric vehicles worldwide. TianJin Lishen Battery Joint-Stock Co., Ltd. is a leading manufacturer of lithium-ion batteries, and through its robust research and development activities, holds more than 1,800 patents.
Who makes lithion batteries?
13. Lithion Battery Inc. Lithion Battery Inc. is a vertically integrated manufacturer of primary and secondary battery cells, rechargeable and non-rechargeable battery packs, and battery modules. The company boasts a full range of in-house engineering, design, and testing capabilities – offering one-stop, comprehensive energy and power solutions.
What are the top lithium-ion battery companies focusing on?
As per the analysis by IMARC Group, the top lithium-ion battery companies are focusing on developing and designing technologically advanced product variants. They are also making heavy investments in research and development (R&D) activities to introduce miniaturized lithium-ion batteries with improved efficiency.
Why is lithium-ion battery manufacturing important?
As this technology becomes more integral to our daily lives, battery manufacturing is pivotal to global energy solutions, the market for lithium-ion battery manufacturers has expanded, with companies competing to produce the most efficient, durable, and environmentally friendly solutions.
Which companies manufacture batteries?
Companies operating in this sector, such as Samsung SDI and Contemporary Amperex Technology Co., Limited, produce numerous products varying from small-sized Li-ion batteries to large power devices. These batteries are essential in numerous applications, including electronic devices, electric vehicles (EVs), and renewable energy storage systems.
Who makes the most EV batteries in the world?
China is the undisputed leader in battery manufacturing, dominating the global production of essential battery materials such as lithium, cobalt, and nickel. Chinese companies supply 80% of the world's battery cells and control nearly 60% of the EV battery market. 13. Amperex Technology Limited (ATL) 12. Envision AESC 11. Gotion High-tech 10.
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Are yellow batteries heavier
The following is a sample of the most popular car battery brands and their approximate weight. As indicate throughout this article, the weight of the car battery should not be given priority before other important specs and details concerning the car battery. The car battery weight can be seen to be a significant factor that affects its overall performance. While it may not be a significant factor as cranking amps, cold cranking amps and the. You understand the basics of car battery weigh for the type of car batteries and brands. Now below the questions are often asked by the readers according to how much does a car battery weigh? I highly suggest you continue to read!.
FAQs about Are yellow batteries heavier
Why is a yellow top battery better than a blue top?
The red top is more vulnerable to going bad if it's drained beyond a particular level. The chemistry of the yellow battery gives it a plus, it is often drained lower and can come back once charged, more sort of a deep cycle battery. Q: What Are the Difference Between Optima Yellow Top Vs Blue Top Deep-Cycle Batteries?
Is yellowtop a good battery?
Seen it cheaper elsewhere? The YELLOWTOP high-performance AGM battery is one of the few true dual-purpose automotive batteries available. With premium cranking power and impressive cycling capability, this heavy-duty battery is also perfect for modern accessory-loaded vehicles.
What is the difference between a red and a yellow battery?
A: The red top is more sort of a standard automotive battery. The yellow top however features a bit different chemistry, which makes it ideal for accessory heavy vehicles (DVD players, heavy-duty car audio systems, etc). The red top is more vulnerable to going bad if it's drained beyond a particular level.
What does a light yellow battery mean?
It is worth noting that while the light yellow color generally indicates a rechargeable battery, it is always essential to check the battery's packaging or labeling for further confirmation. Sometimes manufacturers may use variations in color shades or additional symbols to provide more information or indicate specific features.
What is a yellow battery used for?
They are often used in power tools, medical devices, and other high-drain devices that require a lot of power. Yellow: Yellow batteries are typically rechargeable batteries. They can be used in a wide range of devices and offer the convenience of being able to be recharged multiple times.
What is a yellow top battery?
On the other hand, the Yellow Top is a dual-purpose battery that can be used for both starting and deep cycling applications. This makes it a popular choice for vehicles with high-powered audio systems or other accessories that require a lot of energy.
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Can electric vehicle new energy batteries be exposed to water
Electric vehicle (EV) batteries are the power source that drives the vehicle's motor. While the battery is designed to withstand various environmental conditions, such as extreme temperatures, they are not entirely waterproof. In general, EV batteries have a certain degree of protection against water exposure but are not. Driving an electric vehicle (EV) through a flood can be risky. Floodwater if enter the cars battery compartment or electrical circuits can damage to the vehicle's electrical components and create safety hazards for the occupants. Electric cars can go through a carwash just like traditional gasoline-powered vehicles. However, a few things to remember when taking an. Water damage to an EV battery can be very harmful, and in most cases, it will cause permanent damage to the battery's cells. When water comes. EV lithium batteries are not supposed to come into contact with water, as this can cause serious damage to the battery and create safety hazards for the occupants. When water comes into.
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FAQs about Can electric vehicle new energy batteries be exposed to water
What happens if you put water in an EV battery?
Water getting into an EV battery can cause various issues, ranging from reduced performance to safety hazards, which can have significant consequences for the vehicle and its occupants. Water in your EV battery can cause short circuits, corrosion, and harm the vehicle and occupants. It's crucial to avoid water exposure. Are EV Batteries Waterproof?
Can EV batteries come into contact with water?
EV lithium batteries are not supposed to come into contact with water, as this can cause serious damage to the battery and create safety hazards for the occupants. When water comes into contact with lithium-ion batteries, it can cause a chemical reaction that produces flammable gases, leading to the battery catching fire or exploding.
Are EV batteries safe in a car wash?
It is, therefore, essential to avoid water exposure as much as possible, close all windows and sunroofs when going through a car wash, and ensure the EV battery is dry if it comes into contact with water. EV batteries are not entirely safe from water damage.
Are EV batteries safe from water damage?
EV batteries are not entirely safe from water damage. EV owners must take precautions to prevent water intrusion, including avoiding deep water, using proper handling procedures, and disposing of them correctly. EV owners should be aware of the potential impact of water damage on their batteries and how to prevent it.
Can a EV battery be flooded with water?
Parts of the tests involved flooding an isolated EV battery cell with water several tools, on this picture an E-Extinguishing lance was used.
Can an EV runaway if water enters a battery pack?
While our research indicates ingress of water to an EV battery pack increases the risk of thermal runaway, there is no data to indicate likelihood. EV FireSafe is based in Australia, operating globally. Can an EV in flood electrocute me?
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Distinguishing rechargeable batteries
What Physical Features Distinguish Rechargeable Batteries from Non-Rechargeable Ones?Labeling and Markings: Rechargeable batteries prominently feature markings indicating their rechargeable nature, such as the “rechargeable” label or specific icons.
FAQs about Distinguishing rechargeable batteries
What are the different types of rechargeable batteries?
The four primary types of rechargeable batteries that dominate the market are Lead Acid, Nickel-Cadmium (NiCd), Nickel-Metal-Hydride (NiMH), and Lithium-Ion (Li-ion). Each of these rechargeable batteries offers distinct advantages and limitations, which make them suitable for various applications.
What is the voltage of a rechargeable battery?
Standard size single-use batteries usually have a nominal voltage of 1.5 volts whilst rechargeable batteries are 1.2 volts. The exception being PP3 9 volt block size battery, and some specialist security batteries, which can be higher depending on the size and type of battery. As single-use batteries are consumed, the voltage reduces.
How many times can a rechargeable battery be used?
Rechargeable batteries can be recharged and reused from 500 to 1000 times depending on usage. Common rechargeable battery types include nickel metal hydride (NiMH), nickel cadmium (NiCd) and lithium ion (Li-ion) batteries. RETURN TO TOP Can I use rechargeable batteries in devices that use single-use or alkaline batteries? Yes.
What are the different types of batteries?
Common primary battery types include alkaline, carbon zinc, lithium, silver oxide and zinc air batteries. Rechargeable batteries can be recharged and reused from 500 to 1000 times depending on usage. Common rechargeable battery types include nickel metal hydride (NiMH), nickel cadmium (NiCd) and lithium ion (Li-ion) batteries.
What are rechargeable batteries used for?
Rechargeable batteries are everywhere these days: cordless tools, laptop computers, cordless phones, and cell phones, just to name a few. Rechargeable batteries for use with consumer electronic products are of four basic types: Lithium-ion (Li-Ion).
How long do rechargeable batteries last?
They often last only one to two years. Ni-MH (Nickel-metal hydride) Batteries are a more recent development in the above types of rechargeable batteries. They have many of the same advantages that the Ni-Cad batteries have. However, they suffer much less from the memory effect than Ni-Cd batteries.
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How to test the electrodes of lithium iron phosphate batteries
This comprehensive guide will walk you through the process of testing new LiFePO4 cells and highlight the essential tools needed to perform these checks effectively.
FAQs about How to test the electrodes of lithium iron phosphate batteries
How does lithium iron phosphate positive electrode material affect battery performance?
The impact of lithium iron phosphate positive electrode material on battery performance is mainly reflected in cycle life, energy density, power density and low temperature characteristics. 1. Cycle life The stability and loss rate of positive electrode materials directly affect the cycle life of lithium batteries.
Is lithium iron phosphate a good cathode material for lithium-ion batteries?
Lithium iron phosphate is an important cathode material for lithium-ion batteries. Due to its high theoretical specific capacity, low manufacturing cost, good cycle performance, and environmental friendliness, it has become a hot topic in the current research of cathode materials for power batteries.
Which cathode electrode material is best for lithium ion batteries?
In 2017, lithium iron phosphate (LiFePO 4) was the most extensively utilized cathode electrode material for lithium ion batteries due to its high safety, relatively low cost, high cycle performance, and flat voltage profile.
Are lithium iron phosphate cells stable?
To address this issue, we conducted a detailed analysis of lithium iron phosphate (LFP) cells using near- in-situ electrochemical impedance spectroscopy (EIS). The LFP cells exhibited stable charge/discharge platforms, with a narrow reaction voltage range dividing the process into three distinct stages.
What is the positive electrode material of LFP battery?
The positive electrode material of LFP battery is mainly lithium iron phosphate (LiFePO4). The positive electrode material of this battery is composed of several key components, including:
How to improve cathode material for lithium ion batteries?
Cathode material for LMROs may be improved by using doping and surface coating techniques, such as doping elements are Mg 2+, Sn 2+, Zr 4+ and Al 3+ where the coating material is Li 2 ZrO 3 [, , , , , ]. Furthermore, the LFP (lithium iron phosphate) material is employed as a cathode in lithium ion batteries.
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Several famous brands of lithium batteries
The top 10 lithium-ion battery manufacturers in the world in 2024 includes:CATL (Contemporary Amperex Technology Co., Limited)LG Energy Solution, Ltd. Panasonic CorporationSAMSUNG SDI Co.
FAQs about Several famous brands of lithium batteries
What are the top lithium-ion battery manufacturers in the world?
Another name that deserves attention as one of the top lithium-ion battery manufacturers globally is the LG CHEM. It was initiated in the year 1947 and had its headquarters in Seoul, South Korea! (Additionally,)
Who are the major players in the lithium-ion battery market?
The global lithium-ion battery market has several major players, including A123 Systems LLC, Envision AESC Limited, LG Chem Ltd., Panasonic Corporation, SAMSUNG SDI Co., Ltd., Toshiba Corporation, Amperex Technology Limited, BAK Group, Blue Energy Limited, BYD Company Ltd., CBAK Energy Technology, Inc., Tianjin Lishen Battery Joint-Stock CO., LTD.
Who is the largest lithium-ion battery manufacturer in 2021?
Location: Ningde, China According to Blackridge Research & Consulting's recent study on the global lithium-ion battery market, China-based CATL was the largest lithium-ion battery manufacturer in 2021, with the highest market share. CATL plans to ramp up lithium-ion battery production in the future.
Who makes the first lithium ion battery?
In 1999, LG Chem made Korea's first lithium-ion battery. Later, in the 2000s, it supplied batteries for the General Motors Volt. After that, the company became a key supplier for many global car brands, such as Ford, Chrysler, Audi, Renault, Volvo, Jaguar, Porsche, Tesla, and SAIC Motor.
Who makes lithion batteries?
13. Lithion Battery Inc. Lithion Battery Inc. is a vertically integrated manufacturer of primary and secondary battery cells, rechargeable and non-rechargeable battery packs, and battery modules. The company boasts a full range of in-house engineering, design, and testing capabilities – offering one-stop, comprehensive energy and power solutions.
What is the global lithium-ion battery market?
The global lithium-ion battery market reached US$ 51.0 Billion in 2023. The market is primarily driven by the rising product applications across numerous industries due to the enhanced energy density, lightweight, environment-friendly nature, long operating life, and high-power capacity of lithium-ion batteries.
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Powerful energy storage system welcome to purchase
Welcome to AI+ smart solar energy storage systems powerful enough to cover your entire home where control of your power, up to 200 amps, is just at your fingertips. Storz Power AI+ packages are capable of connecting home systems together, ultimately providing control and access to your entire. EcoFlow OCEAN Pro gives you reliable, Smart home system energy storage that works with solar, the grid, and generators. You can then use your stored energy to power the devices and appliances in your home day and night, during outages or when you want to go off-grid. Commercial and industrial ESS for emergency grid backup, peak load shaving renewable energy storage &. Amptricity's all-in-one solid state systems provide energy storage for peak shaving, self-consumption, time-based control, and backup. Unlike the current lithium-ion technologies in the marketplace.
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What to do if lead-acid batteries are soaked in water
Place them into a plastic garbage bag to avoid further contamination as they become soaked. Disinfect all areas affected by the acid using a solution of mild detergent or vinegar mixed with water.
FAQs about What to do if lead-acid batteries are soaked in water
Can You water a lead acid battery?
It is vitally important that you follow the warning label instructions. If you have a flooded lead acid battery then a battery watering system or battery watering gun will allow you to quickly and safely water your battery. WHEN TO WATER A LEAD ACID BATTERY?
How to maintain a lead acid battery?
One of the most important factors to consider when it comes to lead acid battery maintenance is the water level. Keeping the battery hydrated means that you will have to water your battery regularly. Putting too much water in the cells reduces capacity and conversely not watering them often enough does internal damage both of which are undesirable.
How do you keep a lead battery from leaking?
To keep your lead battery running at leak levels, follow these watering guidelines: If battery plates are uncovered or not submerged in an electrolyte, do not charge them. Instead, fill batteries until just the tops of the battery plates are covered with liquid. Then they are ready for charging.
How often do you add water to a lead acid battery?
How often do you need to add water to a lead acid battery will depend on how often it's used. A marine or golf cart battery that is only used on the weekends may only require watering once a month. A forklift that is used every day, may need to have its battery watered once a week.
What if a lead-acid battery has been submerged in water?
If you have a lead-acid battery that has been submerged in water, there are a few things you need to do in order to ensure the safety of the battery and those around it. First, you need to remove the battery from the water as soon as possible. Second, you need to clean the battery with distilled water and a soft brush.
How do you clean up battery acid spills?
To clean up battery acid spills, first put on a pair of rubber gloves as well as a safety mask or goggles. Place the battery in 2 plastic bags, seal the bags tightly, and inspect the battery label to see what type it is. For an alkaline battery, clean up the spill using a mild acid like vinegar or lemon juice.
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Lead-acid batteries can be replaced after a few years
A lead-acid battery can generally last between 3 to 5 years. The lifespan depends on various factors such as usage, maintenance, and environmental conditions.
FAQs about Lead-acid batteries can be replaced after a few years
How long does a lead acid battery last?
The lifespan of a lead-acid battery typically ranges from 3-8 years: Flooded Lead-Acid Batteries: Usually last around 4 to 6 years. Sealed Lead-Acid Batteries (AGM, Gel): Generally last about 3 to 5 years. Factors Affecting Lifespan Usage Conditions: Frequent deep discharges and high discharge rates can shorten the lifespan.
Do lead acid batteries degrade over time?
All rechargeable batteries degrade over time. Lead acid and sealed lead acid batteries are no exception. The question is, what exactly happens that causes lead acid batteries to die? This article assumes you have an understanding of the internal structure and make up of lead acid batteries.
When is it time to replace a lead-acid battery?
Leaking: Leaking acid is a serious sign of battery aging. Cracks or damage in the battery casing can cause leaks, indicating that the battery needs replacement. These key signs can help you assess when it's time to replace a lead-acid battery. Proper charging is essential for extending the life of lead-acid batteries.
How to maintain a lead acid battery?
Temperature plays a vital role in battery performance. Extreme heat can shorten lifespan, while extreme cold can affect capacity. Storing batteries in a moderated environment ensures better longevity. By adopting these maintenance tips, users can maximize their lead acid battery lifespan.
Can a lead acid battery be left uncharged?
Higher temperatures significantly prolong battery life. You can leave a lead acid battery uncharged indefinitely. Double the charging voltage will double the battery lifespan. Using a battery regularly is more harmful than letting it sit unused. Lead acid batteries should be fully discharged before recharging is a common myth.
Should a lead acid battery be fused?
Personally, I always make sure that anything connected to a lead acid battery is properly fused. The common rule of thumb is that a lead acid battery should not be discharged below 50% of capacity, or ideally not beyond 70% of capacity. This is because lead acid batteries age / wear out faster if you deep discharge them.