3S 12.6V 20A Li-ion BMS Protection Board — 18650, Drill Motor, -40°C to 85°C

3S 12.6V 20A Li-ion BMS Protection Board 18650, Drill Motor, -40°C to 85°C

$4.88 USD

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3S 12.6V 20A Li-ion BMS Protection Board — 18650, Drill Motor, -40°C to 85°C

This 3S 20A BMS protection board is designed for high-current 3-cell series Li-ion battery packs used in power tools, drill motors, and high-drain applications. Rated at 20A continuous discharge with full overcharge, overdischarge, and overcurrent protection, it handles demanding loads that standard 6A BMS boards cannot support.

Key Specifications

Parameter	Value
Configuration	3S (3 cells in series)
Full Charge Voltage	12.6V (4.2V per cell)
Continuous Discharge Current	20A
Overcharge Protection	4.25V ±0.05V per cell
Over-Discharge Protection	2.5V ±0.1V per cell
Overcurrent Protection	~40A peak
Operating Temperature	-40°C to +85°C
Compatible Cells	18650, 26650, Li-ion pouch

20A vs 6A BMS — Which to Choose?

Feature	20A BMS (This Product)	6A BMS
Continuous Current	20A	6A
Best For	Drill motors, power tools, robotics	LED strips, small electronics
Peak Current	~40A	~12A

Why Choose This 20A BMS?

✅ 20A continuous rating — handles drill motor startup surge and sustained load
✅ -40°C to +85°C — reliable in cold garage and hot workshop environments
✅ Full protection suite — overcharge, overdischarge, overcurrent, short circuit
✅ 18650 compatible — standard cell format for DIY battery packs
✅ Compact PCB — fits inside standard power tool battery enclosures