4S 100A Li-ion BMS Protection Board with Balance Function
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Prices updated: 13 Oct 2026
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About this product
A 4-series Li-ion battery protection board with a 100A rating as stated in the title, a 60A charging current and a cell balance function. It protects the pack and balances cell voltages to keep them closely matched, with a balance voltage range of 3.355 to 3.455V as listed. Suitable for building 4S Li-ion packs for higher-current projects.
Specifications
- Cell configuration
- 4S
- Cell chemistry
- Li-ion
- Current rating
- 100A
- Charging current
- 60A
- Balance function
- Yes
- Balance current
- 50mA
- Balance voltage range
- 3.355-3.455 V
Frequently asked questions
What voltage does a 4S Li-ion pack use?
A 4S Li-ion pack has a nominal voltage of about 14.8V and is fully charged at about 16.8V (4.2V per cell). Make sure your charger and load match this range.
How do I connect the balance leads?
Connect each balance lead to the junction between consecutive cells, in order from the negative end to the positive end. Do not skip or reverse a lead, as this can damage the cells or the board.
