18650 7S2P 25.9V 4Ah Battery
The 18650 7S2P 4Ah battery pack is a battery pack consisting of 7 18650 cells connected in series to form 7 series batteries. The two series groups are connected in parallel to achieve a 4Ah battery pack. Reconnect the protective board and form it after insulation treatment.
We use imported 18650 battery cells from LG, Samsung, Sony, and others. In addition to high-quality battery cells, we have designed the optimal 7-series protection board to provide you with the best 7S2P battery pack.
- UL1642
- IEC62133
- UN38.3
- MSDS
18650 7S2P lithium ion battery specs
-
Charging Voltage 29.4V
-
Nominal Voltage 25.9V
-
Nominal Capacity 4Ah
-
Discharge Cut-off Voltage 21V
-
Charge Current 2A
-
Max Charge Current 4A
-
Discharge Current 2A
-
Max Discharge Current 4A
-
Operatingt Tmperature -20~60℃
-
Dimension 130*68*38mm
-
Weight 644g
-
Lifespan 500
-
PCM Yes
-
Customization Yes
18650 battery pack factory
7S2P lithium ion battery with BMS
Our 25.9v 18650 battery pack is equipped with an intelligent circuit board for overcharge, overdischarge, and short circuit protection. It is suitable for various application fields such as electric scooters, electric bicycles, wireless vacuum cleaners, etc.
We can choose high rate battery cells based on the actual application of the customer, such as 3.0C and 5.0C rate charging and discharging, to instantly provide high-power discharge.
The image on the right shows the structure of our 18650 battery. It is made of precision welded nickel bars that connect the positive and negative terminals to ensure a stable charge discharge curve and provide reliable power supply.
18650 battery pack factory
18650 battery packs 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 & connector selection
18650 7S PCM and connector
The main function of 25.9V 7S lithium battery protection board ensures the safe and normal operation of the battery, as follows:
- Overcharge protection: usually charging cut-off protection voltage 25.2±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 18±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 18650 Battery Selection
Select the number of 18650 battery cell 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
Get 18650 7S2P 25.9v 4Ah battery quote today
We will evaluate your project and get back to you within 1 working day.
