3S Li-ion 18650 BMS Protection Board 12.6 V 15 A
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Prices updated: 13 Oct 2026
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About this product
A protection board for a 3-cell (3S) series 18650 Li-ion pack rated at 12.6 V. It guards against overcharge, over-discharge, short circuit and overcurrent, with a 15 A operating current and a 30 A peak. Use it to protect a 3S pack in portable power and battery DIY projects.
Specifications
- Cell configuration
- 3 series (3S)
- Overcharge detection voltage
- 4.25 ± 0.025 V per cell
- Overcharge release voltage
- 4.15 ± 0.05 V per cell
- Over-discharge detection voltage
- 2.50 ± 0.08 V per cell
- Over-discharge release voltage
- 3.00 ± 0.1 V per cell
- Operating current
- 15 A (10 A natural cooling, 15 A with heat sink)
- Maximum instantaneous current
- 30 A
- Operating temperature
- -40 to +85 °C
Frequently asked questions
Is this board suitable for a 3S 18650 battery pack?
Yes, it is designed for a 3-string Li-ion pack rated at 12.6 V. Do not use it on packs with a different number of cells, such as 2S or 4S.
What current can the board handle?
The operating current is 15 A with a heat sink, or 10 A with natural cooling. It tolerates a maximum instantaneous current of 30 A. Keep continuous load within the operating current for the cooling method you use.
