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4S 30A Li-ion BMS Battery Protection Board 14.4V 14.8V 16.8V Charging PCB Module for 18650 Lithium Battery Packs Passive Cell Balance Overcharge Over-Discharge Overcurrent Short Circuit Protection
- Designed for 4S 18650 lithium-ion battery packs, providing the required protection and balance management for four series-connected cells.
- Supports 14.4V/14.8V nominal battery packs and a 16.8V full-charge voltage for the specified 4S configuration.
- Rated for 30A continuous discharge current, supporting power tools, e-bikes, portable power stations and DIY energy storage.
- Built-in passive cell balancing helps maintain more even voltage levels across the four series cells during battery operation.
- Integrated protection helps guard against overcharge, over-discharge, overcurrent and short-circuit conditions.
- Precision voltage detection monitors each cell with overcharge protection at 4.25V ±0.025V per cell.
- Over-discharge protection is set at 2.50V ±0.08V per cell to help prevent excessive discharge of the connected lithium cells.
- The module can automatically recover after the abnormal condition is removed, simplifying battery pack operation.
- Compact board design supports simple wiring and battery assembly, with an operating temperature range of -30°C to +80°C. Not for LiFePO4 batteries.
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Overview
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Product Description:
This 4S Li-ion battery protection board is designed for 4-series 18650 lithium-ion battery packs. It provides battery management for applications such as power tools, e-bikes, portable power stations, DIY energy storage projects, power drills, and small motor equipment.
Core Selling Points:
Built-in passive cell balancing helps keep four lithium cells balanced. Multiple protection functions help guard against overcharge, over-discharge, over-current, short circuit, and temperature-related risks. The board supports 30A continuous discharge current, uses high-precision voltage detection, and can automatically recover after abnormal conditions are removed. Its compact design supports simple battery assembly and wiring.
Technical Specifications:
Type: 4S Li-ion BMS protection board
Applicable cell: 4S 18650 Li-ion battery
Continuous current: 30A
Nominal voltage: 14.4V / 14.8V
Full charge voltage: 16.8V
Balance function: Passive cell balance
Protection: Overcharge, over-discharge, over-current, short circuit
Overcharge voltage per cell: 4.25V ±0.025V
Over-discharge voltage per cell: 2.50V ±0.08V
Operating temperature: -30 ~ +80
Before Purchase:
Use only with 4S 18650 Li-ion cells. This board is not compatible with LiFePO4 batteries. Confirm that the battery configuration, voltage, and application requirements match the listed specifications before installation.
Warranty & Returns
Warranty, Returns, And Additional Information
Warranty
- Please contact the Seller directly for warranty information. Warranty information may also be found on the Manufacturer's website.
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Return Policies
- Return for refund within: 30 days
- Return for replacement within: non-replaceable
- This item is covered by GeekSpace Return Policy
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