Innovative 12V Lithium-ion Battery Factory: Your Reliable Wholesale Partner

china 12v deep cycle battery For over 13 years, KET has been one of the leading manufacturers of 12V Lithium ion battery packs. 20+ people in R&D team and consistent strict QC are the secrets of KET's success.

china 12v lithium ion car battery 12V Li-ion batteries have the trend to replace 12V lead-acid batteries. KET can make alternative solutions for different sizes of lead-acid batteries. Smaller size, lighter and more efficient.

china deep cycle lithium battery 12v Use the best BMS protection board. Avoiding overcurrent, short circuit, overcharge, and over-discharge is our minimum standard. At the same time, we can add custom additional functions for you, such as adding Bluetooth function, communication protocol, etc.

12v lithium battery manufacturers Fast sample delivery capability. After confirming the parameters, we can finish the sample-making and shipping within 3 days.

12v lithium ion battery manufacturers Support small batch OEM 12v battery. We are willing to grow with our customers, share the risk, and develop each new project together. Small batch customization allows you to complete the market testing of your project at a small cost.

Innovative 12V Lithium-ion Battery Factory: Your Reliable Wholesale Partner

Advantage of KET 12V Lithium-ion Battery

Good Charge Retention

Li-ion batteries have a low self-discharge rate (about 3% per month), which is ideal for long-term storage.

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Wide Temperature Range

Discharge temperature -21℃~60℃; charging temperature 0℃~45℃.

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High Energy Density

Lead-acid batteries and nickel batteries are very common, but their energy density is only 1/3 and 1/2 of lithium-ion batteries, respectively.

No Memory Effect

Compared with NiCd batteries, Li-ion batteries do not need to be discharged before charging, so charging is fast and convenient.

Environmentally Friendly

It meets the requirements of cadmium-free, lead-free and mercury-free, and is a kind of ECO battery.

Long Cycle Life

The general lithium-ion battery cycle times are more than 500 times, and LiFePo4 battery (a kind of lithium-ion battery) is able to reach more than 2000 times.

Fast Charging

Lithium-ion batteries can be charged quickly, allowing for shorter charging times and less downtime for devices that use them.

Light Weight

Lithium-ion batteries are lightweight, which makes them ideal for use in portable devices that need to be carried around.

Choose Your 12v Lithium Ion Battery Pack

Lithium Ion 12V 3Ah Battery Wholesale

Factory Direct 12V 4Ah Lithium Ion Battery

12V 5Ah Li-ion Battery

China 12V 5Ah Lithium Ion Battery

12V 6Ah Lithium-ion Battery

12V 7Ah Lithium Lifepo4 Rechargeable Battery Replacement

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Li-Ion 12V 9Ah Battery Pack OEM/ODM

Li-Ion LFP 12V 10Ah Battery Bulk Buy

12V 12Ah Lithium Rechargeable Battery Replace Lead Acid Battery

Bulk Buy Lithium Ion 12V 14Ah Battery Bulk Buy

Custom Lithium Ion 12V 15Ah Battery

Lithium 12V 17Ah Battery Pack Customized

12V 18Ah Lithium Battery from China

Wholesale 12V 20Ah Lithium-ion Battery

Deep Cycle Lithium 12V 22Ah Battery

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12V 50Ah Lithium-ion Battery Replace Lead acid

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12V 400Ah Li-ion Battery Pack

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From Theory to Practice: A Practical Guide to 12V Lithium Ion Batteries

What is a 12V lithium-ion battery?: A lithium-ion battery is a type of rechargeable battery that uses lithium ions to store and release energy.

A 12V lithium-ion battery can be obtained by connecting multiple cells in series and parallel, where each cell typically has a nominal voltage of 3.2-3.7V. For example, with 3.2v cells we can obtain a 12v battery (actual nominal voltage 12.8v) using the following series and parallel connections:
1. 4S1P: 4 battery cells
2. 4S2P: 8 battery cells
3. 4S3P: 12 battery cells
4. 4S4P: 16 battery cells

Common types of lithium-ion batteries based on their chemical composition include lithium cobalt oxide (LCO), lithium manganese oxide (LMO), lithium iron phosphate (LFP), and lithium nickel cobalt aluminum oxide (NCA). Here it is important to highlight the LFP battery, which has become a superstar in the battery industry because of its more environmentally friendly nature and superb cycle life.

Can I replace a 12V lead acid battery with lithium-ion?: The answer is yes. It is OK to replace a 12V lead acid battery with a 12V lithium ion battery. However, it is important to ensure that the batteries are compatible in terms of voltage and capacity. And use a charger that is compatible with 12V lithium-ion batteries for charging.

Can I use a normal 12v charger on lithium battery?: The answer is no. You cannot just charge a lithium ion battery with a normal charger, it is very dangerous. Make sure it is compatible before charging a 12V lithium-ion battery.

What are your quality tests for the 12v lithium-ion battery pack?: During the manufacturing process of a battery pack, the following tests are typically conducted:

Capacity test: This test determines the amount of charge that the battery can store and deliver.

Voltage test: This test measures the voltage of the battery to ensure that it meets the required specifications.

Internal resistance test: This test measures the resistance within the battery to ensure that it is functioning properly.

Temperature test: This test checks the battery's temperature to ensure that it is within the acceptable range.

Cycling test: This test measures the battery's performance over a number of charge and discharge cycles to ensure that it can maintain its capacity over time.

Safety test: This test ensures that the battery is safe to use and that it will not pose a risk of fire or explosion.

Leakage test: This test checks for any leaks in the battery to ensure that it is properly sealed.

Impact test: This test simulates the effects of an impact on the battery to ensure that it is durable and can withstand typical use.

Drop test: This test simulates the effects of dropping the battery to ensure that it is durable and can withstand typical use.

What is the charging rate of the 12v lithium ion battery?: The charging rate of a 12V lithium-ion battery is typically expressed in terms of the current multiplier, or "C". C represents the multiple of the battery's rated capacity, which is typically measured in ampere-hours (Ah). For example, for a 12V 10Ah lithium-ion battery, a charge rate of 0.5C would mean charging it at a current of 5A, while a charge rate of 1C would mean discharging it at a current of 10A.

So what exactly is the charge rate of 12v?

Generally speaking the charge rate for Li-Ion is between 0.5C-1C (for LFP batteries it is mostly 0.5C-0.8C). So what do we do if none of KET's 12V Li-Ion battery packs have the charge rate we need? Don't worry, did you forget that KET is an oem 12v battery factory? We can customise the size, capacity and charge rate, so all you need to do is give us some parameters and our team of engineers will help you with the rest of the professional issues.

What happens if you charge a lithium battery with too much voltage?: If you charge a lithium battery with too much voltage, it can result in overcharging, which can be dangerous and potentially damage the battery. Lithium-ion batteries have a maximum charging voltage limit, and exceeding this limit can cause several issues, such as: Overheating, Reduced battery life, Leakage, Risk of fire, etc.

But all of KET's battery packs, including the 12V lithium-ion packs, are safe for you to use. This is because all our battery packs will have an intelligent BMS with overcharge, overdischarge and short-circuit prevention functions.

What is the 12v lithium ion battery discharge curve?

In order to let you understand the advantages of the discharge curve of 12V Li-ion battery, KET's engineers have tested the discharge data of both it and 12V lead-acid battery. The following is a comparison chart of the discharge curves based on the test data of both.

It can be seen that the voltage of lithium-ion battery is relatively stable during most of the discharge time, while the voltage of lead-acid battery has been dropping significantly throughout the discharge process.

What is the 12v lithium ion battery cutoff voltage?: First of all, lithium-ion battery is a generic term. 12 V lithium-ion battery cut-off voltage depends on the specific chemistry and design of the battery. It can be roughly divided into two cases:

1. For ordinary lithium-ion batteries, the lithium cell is generally rated at 3.7V and the cut-off voltage is set at 2.75V. So the cut-off voltage of a 12V lithium-ion battery is 2.75V*4=11V

2. For LiFePO4 battery, single LiFePO4 battery cell is generally rated at 3.2V and the cutoff voltage is set at 2.5V. So the cutoff voltage of 12V Li-ion battery is 2.5V*4=10V

What is the minimum voltage for 12V lithium-ion battery?: Here we need to introduce the concept of cut-off voltage. KET's 12v li-ion battery packs are protected by BMS with a cut-off voltage. However, the cut-off voltage varies depending on the composition of the lithium battery or the customer's custom requirements.

The cut-off voltage of a 12V LFP battery pack is usually around 10V, which is the "minimum voltage" of the pack.

How to maintain the 12 volt lithium ion batteries?: If you intend to store the battery for a long period of time, it is recommended that it is charged to 50% before storage. Lithium batteries have a low self-discharge rate of around 3%. You need to avoid the battery capacity dropping below 20%, so it is usually necessary to re-charge the battery at intervals of 3-6 months. Li-ion batteries perform best at room temperature. Exposure to high temperatures will cause accelerated battery degradation. Keep the battery in a cool, dry place when not in use. Check the battery regularly for any signs of damage or swelling. If you notice any problems, stop using the battery immediately.

How to connect 4 12v li-ion batteries to make 24v？: It's time for a new "electric knowledge lesson". The first thing we need to know is that when connected in series, the voltages add up, while when connected in parallel, the voltages remain the same.

For example:
1. Two 12v batteries connected in series will have a voltage of 24v
2. Two 12v batteries connected in parallel will still have a voltage of 12v

So how to connect 4 12v li-ion batteries to make 24v?
The answer is 2S2P. The connection diagram is as follows:

How battery management system protects cells of the 12v lithium-ion battery pack?: The Battery Management System (BMS) is a "secret weapon" used by KET to protect the cells in 12v Li-ion battery packs. Here are the 4 main ways in which KET's BMS helps to protect the battery:

Overcharge protection: The BMS monitors the battery voltage and stops the charging process when the voltage reaches a certain level, thus preventing overcharging.

Over-discharge protection: Over-discharge of lithium-ion batteries can cause irreversible damage to the battery, the BMS prevents over-discharge by monitoring the battery voltage and shutting down the battery when the voltage falls below a certain level.

Short circuit protection: The BMS also protects the battery pack from short circuits, which can cause high currents to flow through the battery, potentially damaging it or causing a fire.

Overcurrent protection: Overcurrent protection detects if the current in the battery cell exceeds a safe range and stops the battery from being charged or discharged if necessary. This prevents the battery from overheating, damaging or causing a fire.

Do you also find KET's BMS very powerful? KET always adheres to the "safety first, safety first" philosophy, so that our customers can use their batteries safely and securely.

How can I calculate how long a 12v lithium ion battery will last?: To calculate how long a 12V lithium battery will last, you need to know the capacity of the battery and the amount of current that will be drawn from it. The capacity of a battery is measured in ampere-hours (Ah), which is the amount of current that can be drawn from the battery for one hour before it is fully discharged.

Let's assume you have a 12V lithium battery with a capacity of 100Ah, and you are drawing a constant current of 10A from the battery.

To calculate the estimated runtime of the battery, you can use the following formula:

Battery runtime = Battery capacity (Ah) / Current draw (A)

In our example, the runtime would be:

Battery runtime = 100Ah / 10A = 10 hours

However, it's important to consider the depth of discharge (DoD) when calculating battery runtime. DoD refers to the amount of the battery's capacity that is used before it is recharged. Lithium batteries have a recommended maximum DoD of 80%, which means you should not discharge the battery below 20% of its capacity.

Taking the maximum DoD into consideration, the runtime of the battery would be:

Battery runtime = (Battery capacity x DoD) / Current draw

Battery runtime = (100Ah x 0.8) / 10A = 8 hours

So, in this scenario, the 12V lithium battery with a capacity of 100Ah and a constant current draw of 10A will last for approximately 8 hours before it needs to be recharged, assuming a maximum depth of discharge of 80%.

What is the voltage of a 12V lithium-ion battery when full charge?: The voltage profile of lithium batteries varies from chemical composition to chemical composition. And even for lithium batteries of the same composition, the voltage can be affected by the operating temperature and other aspects. Taking a 12V LFP lithium-ion battery as an example here, a fully charged 12V lithium iron phosphate battery will typically have a voltage of around 14.2 to 14.6 volts.

Can you charge 12v lithium battery with 12v lead acid charger?: It is generally not recommended to use a lead-acid charger to charge lithium-ion batteries. If in an emergency you must try to do so, then please read on.

You can use a lead-acid charger under two conditions: you have a lead-acid charger that can be set to the maximum voltage and the charger is not in automatic equalisation mode (most chargers have turned this mode off).

This situation is generally safe to use this lead-acid charger. However, once the lithium-ion battery is fully charged, you must stop charging immediately to avoid damaging the battery.

Do 12v lithium ion batteries leak?: While lithium batteries are generally less prone to leakage compared to alkaline batteries, extreme conditions such as physical damage or improper charging can lead to rare instances of leakage or electrolyte exposure. However, the internal design of lithium batteries, including the use of solid or gel electrolytes and barriers to prevent leakage, helps maintain their safety. If a lithium battery does leak, it is important to avoid direct contact, use personal protective equipment, ensure ventilation, and carefully clean up and dispose of the spill in accordance with proper battery recycling procedures.