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SKU: 260428005416
Warranty : 3 Days
৳ 450.04
Category: Battery
Additional Information
The LifePO4 4S 12.8V Lithium Iron Phosphate Battery Protection Board (BMS) is designed to provide reliable protection and management for 4-cell (4S) LiFePO4 battery packs. It safeguards the battery against overcharging, over-discharging, excessive current, and other abnormal operating conditions, helping to extend battery life and improve overall system safety.
This protection board is suitable for various LiFePO4 battery-powered applications, including solar energy storage systems, backup power supplies, electric vehicles, portable power stations, DIY battery packs, and industrial equipment.
| Parameter | Specification |
|---|---|
| Product Type | LiFePO4 Battery Protection Board (BMS) |
| Battery Configuration | 4S (4 Cells in Series) |
| Nominal Battery Voltage | 12.8V |
| Dimensions | 60 × 40 × 7 mm |
| Maximum Working Current | 18A |
| Upper Limit Instantaneous Current | 20A |
| Over-Charge Protection Voltage | 3.75V ± 0.05V (per cell) |
| Over-Discharge Protection Voltage | 2.35V ± 0.05V (per cell) |
| Charging Voltage | 14.4V – 15V |
| Battery Type | Lithium Iron Phosphate (LiFePO4) |
This diagram illustrates how to correctly connect a 4S (4-Cell Series) LiFePO4 Battery Protection Board (BMS) to build a safe and balanced 12.8V battery pack.

Battery Cell Configuration (Series): Four LiFePO4 cells are connected in series (positive to negative) to reach the nominal 12.8V output.
Balance Wiring (Thin Lines): These wires connect to the white sampling plug on the BMS to monitor and balance each individual cell:
B+ (Red): Connects to the main positive terminal of the first cell.
B3 (Pink): Connects to the junction between Cell 1 and Cell 2.
B2 (Yellow): Connects to the junction between Cell 2 and Cell 3.
B1 (Blue): Connects to the junction between Cell 3 and Cell 4.
B- (Black): Connects to the main negative terminal of the last cell.
Main Power Input/Output (Thick Lines): * P+ (B+): Acts as the Common Positive Cathode for both charging the battery and discharging to your load.
P- (Black Wire): Acts as the Common Negative Electrode for both the charger and your load. All safety cut-offs (overcharge/over-discharge) are managed through this port.
Notes
TechShopBD offers up to one year of warranty and replacement support for its products, depending on the supplier(s) and product(s). The specific warranty duration for each product can be found on the respective product page. To be eligible for warranty and replacement support, customers must agree to our terms and conditions.
Note: This item is non-returnable. If this item arrives damaged or is not functioning properly, please don’t hesitate to contact us to determine if further action is required.
Our engineers are available to assist you. If you have any queries, please leave a comment below or call 09678110110 from 09:00 am to 06:00 pm (7 days a week). You can also reach us via WhatsApp or Facebook Inbox
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৳ 450.04
The latest and best price of LifePo4 4S 12.8V Lithium Iron Phosphate Battery Protection Board in BD is BDT 450.04 Taka. You can purchase the LifePo4 4S 12.8V Lithium Iron Phosphate Battery Protection Board at the best price on TechShopBD.com or visit our office to pick yours up today.
You can easily buy the LifePo4 4S 12.8V Lithium Iron Phosphate Battery Protection Board at the best price in BD from TechShopBD.com (our online store) or visit our physical office.
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