Enjoy Free Shipping when you order 4* 206Ah LiFePO4 cells (TYPE B) or more.
Big Wei Battery supplies welding service for free.
If your configuration is different from TYPE A OR B
please contact Big Wei Battery before you place the order.
The cells will be wrapped together when you choose Type A B
as is shown in the picture below:
Below are the ratings for a pack of 4 cells:
- Nominal voltage: 12.8V
- Discharge Cut-Off Voltage: 10V
- Charge Cut-Off Voltage: 14.6V
- Standard Discharge: 100A (0.5C)
- Standard Charge: 100A (0.5C)
- Fast Charge: 0.5C
- Fast Discharge: 1C
- Maximum Charge Current: 1C
- Maximum peak discharge current: 2C
- Weight: 4.15kg per cell, approx 16.6kg for a set of 4
- Cycle life up to 8000+ times for Deep Cycle.
Characteristics of LiFePO4 Cells:
Charge Mode & Specification:
| Description/Item | Specifications | Remarks |
| Standard Charge Current | 0.5C | |
| Standard Charge Voltage | < 3.65V | |
| Standard Charge Mode | Using 0.5C Constant Current (CC) to charge to 3.65V, then Constant Voltage (CV) at 3.65V to charge until the charge current reaches the lower limit of 5.0+ 0.5A. | |
| Standard Charge Temperature | 25°C | Cell Temperature |
| Absolute Charge Temperature | 0-55°C | Terminating charge process, once the cell temperature is beyond Absolute Charge Temperature. |
| Absolute Charge Voltage | <3.8V | Terminating charge process, once the cell OCV is beyond Absolute Charge Voltage. |
Other Charge Mode:
| Cell Temperature | Standard Charge | Rapid Charge | Cell Temperature |
| <0°C | Prohibited to charge | Prohibited to charge | <0°C |
| 0-10°C | Charge Current 0.1C | Prohibited to charge | 0-10°C |
| 10-15°C | Charge Current 0.2C | Charge Current 0.3C | 10-15°C |
| 15-25°C | Charge Current 0.3C | Charge Current 0.5C | 15-25°C |
| 25-45°C | Charge Current 0.5C | Charge Current 1.0C | 25-45°C |
| 45-55°C | Charge Current 0.3C | ||
| >55°C | Prohibited to charge | ||
Discharge Mode:
| Description | Parameters | Remarks | |
| Standard Discharge Current | 50.0A | * 25°C | |
| Maximum Continuous Discharge Current | 100.0A | * N.A. | |
| Maximum Discharge Long-Pulse Current | 200.0A | * 3 minutes maximum | |
| Maximum Discharge Short-Pulse Current | 300.0A | * Cell temperature lower than 50°C * When SOC>40%, 60s maximum * When SOC<40%, 10s maximum |
|
| Discharge cut-off Voltage | >2.5V | * N.A. | |
| Standard Discharge Temperature | 25°C | * Cell Temperature | |
| Absolute Discharge Temperature | -20–55°C | Regardless of the discharge mode, the discharge process should be terminated, once the cell temperature is beyond Absolute Discharge Temperature. |
Charge cut-off and Protection:
| Description | Parameters | Remarks |
| Charge cut-off Voltage | 3.65V | Terminating charge process when cell OCV reaches 3.65V. |
| First Over-charge Protection | >3.8V | Limiting charge current to 0 when cell OCV reaches 3.8V. |
| Second Over-charge Protection | >4.0V | Limiting charge current to 0 when cell OCV reaches 4.0V. Locking BMS before the problem is identified and resolved. |
| Discharge cut-off Voltage | 2.5V | Terminating discharge process when cell OCV reaches 2.5V. |
| First Over-discharge Protection | 2.0V | Limiting discharge current to 0 when cell OCV reaches 2.0V. |
| Second Over-discharge Protection | 1.8V | Limiting discharge current to 0 when cell OCV reaches 1.8V. Locking BMS before the problem is identified and resolved. |
| Short Circuit Protection | Prohibit Short Circuit | Cutting off overcurrent devices (fuses, circuit breakers). |
| Charging Time Protection | <8h | Terminating charge process when charging time exceeds 8 hours. |
- Safety Pressure Release Valve
- Standard new safety technology for high-quality batteries.
- Prevents explosions caused by excessive internal pressures due to overcharging, short circuits, excessive temperature, battery deformation, or puncture.
- The safety valve on top is very important for the explosion-proof barrier. When the pressure inside the battery is built up, the safety valve opens to avoid an explosion.
- No Memory Effect
- Rechargeable batteries work under conditions that are often not fully discharged, and the capacity will quickly fall below the rated capacity. This phenomenon is called the memory effect. There are memories like nickel-metal hydride and nickel-cadmium batteries, but lithium-iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can be used with charging, no need to discharge and recharge.
I am very impressed by the overall performance of each cell in the 16 cell pack. The cell voltages all rise and fall together during charge and discharge.
Prompt delivery, well packaged and bus bars welded as required. Just a few more cables etc and ready to try
The purchase was simple but my complaint was that I received nothing by way of conformation from you that it had even been processed. It fact, the first conformation was a couple of days later from the courier saying the item was out for delivery that day. An email telling me what was going on would have been good.
Thanks for your feedback, we truly appreciate it! Regarding the email confirmation, we are sorry about that. We have checked it with our developer and found out that in December, there were issues with our SMTP server which caused some problems in our web email automated responses and/or order updates. Beginning of this year, we have already fixed the issue and everything is working normally.