18650 2S2P 7.2V 4Ah Battery
The 2s2p 18650 battery pack is a common lithium-ion battery widely used in various digital electronic products. It comes with a built-in 2S2P protection board, providing overcharge, over-discharge, overcurrent, and short-circuit protection.
We can provide UL1642, IEC62133, MSDS, and UN38.3 certifications according to customer requirements.
- UL1642
- IEC62133
- UN38.3
- MSDS
18650 battery 7.4v 4000mah specs
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Charging Voltage 8.4V
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Nominal Voltage 7.4V
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Nominal Capacity 4Ah
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Discharge Cut-off Voltage 6V
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Charge Current 2A
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Max Charge Current 4A
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Discharge Current 2A
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Max Discharge Current 8A
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Operatingt Tmperature -20~60℃
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Dimension 68*38*38mm
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Weight 195g
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Lifespan 500
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PCM Yes
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Customization Yes
18650 battery pack factory
18650 li ion battery 7.4v 4000mah with protection board
We manufacture high quality 7.4v 18650 battery packs with built-in circuit boards for overcharge, overdischarge and short circuit protection. It needs to be charged with constant current constant voltage and constant voltage charger. It is suitable for all kinds of electronic devices that need 7.4V power supply.
Charge and discharge currents can be generated according to customer requirements, such as 1.0C and 3.0C discharge rates. Besides the 18650 2s2p battery, we can also customize different 18650 battery packs.
The picture on the right shows the structure of our 18650 battery. It is made of precision welded nickel strips connecting the positive and negative terminals to ensure a stable charge/discharge curve and provide reliable power.
18650 battery pack factory
18650 rechargeable battery 4000mah charge & dishcarge curve
18650 12S2P 44.4V 5Ah battery pack charge and discharge curve. You will find the curve flat from 0.2C, 1C, 2C, 3C rate discharge current.
- 18650 12S2P 5Ah battery 0.2C discharge curve
- 18650 12S2P 5Ah battery 1C dsicharge curve
- 18650 12S2P 5Ah battery 2C discharge curve
- 18650 12S2P 5Ah battery 3C discharge curve
18650 battery pack PCM & connectorselection
4000mah 18650 rechargeable lithium battery connector & PCM
The main function of 7.4v lithium battery protection board ensures the safe and normal operation of the battery, as follows:
- Overcharge protection: usually charging cut-off protection voltage 8.56±0.025V, once the charging cut-off voltage is reached, the protection circuit will be disconnected.
- Over-discharge protection: usually over-discharge cut-off voltage voltage 6±0.025V, once the over-discharge cut-off voltage is reached, the protection board will be disconnected.
- Short circuit protection: Once short circuit occurs, the protection board will disconnect the circuit automatically in a few milliseconds.
- Over-current protection: once the protection board reaches the set current value, the protection board will automatically disconnect.
The mainstream terminal models of 18650 battery packs are as follows:
- JST-XH, JST-PH, JST-SM
- Molex 51021, Molex 5557, Molex Micro-Fit 3.0
- Amphenol AT Series, Amphenol PT Series
- TE AMP Superseal, TE Micro MATE-N-LOK
Lithium-ion battery production process
#1 Cell Selection
Select the number of 18650 cells or LiFePO4 cells we need. Ensure they works fine.
#2 Battery Sorting
Make sure that the capacity, voltage, and internal resistance of the selected cells are consistent.
#3 Arrangement & Assembly
Combine the required battery modules in a series-parallel manner.
#4 Spot Welding
The positive and negative terminals of the battery are connected via nickel tabs to form the desired capacity or voltage.
#5 Mounting Protection Board
Connect the protection board on the battery pack to ensure that its overcharge, overdischarge and short circuit protection functions properly.
#6 Packaging & Aging
Wrap the battery pack in a PVC or metal casing while charging and discharging to activate the battery pack performance.
Get Started
18650 2S2P 7.4V42Ah battery quote today
We will evaluate your project and get back to you within 1 working day.
