6S 22V 18650 Lithium Battery BMS Protection Board

This 6S (6-cell) battery management board protects 18650 or 21700 lithium-ion packs wired in series for long-range, endurance or cinematic FPV platforms, guarding against overcharge, over-discharge and short circuits during charging.

Key features

• Protects a 6S (nominal 21.6–22.2V) lithium-ion pack, rated for up to 15A continuous charge and discharge current.
• Automatically cuts off on overcharge or deep over-discharge to prevent permanent cell damage.
• Built-in short-circuit protection guards against wiring faults during assembly or field use.
• Does not include cell balancing — cells must be matched and balanced before assembly, and monitored independently afterwards.
• Low-profile PCB sits flat under heat-shrink alongside the cells for a compact custom pack.

Specifications

• Configuration: 6S (6 cells in series)
• Cell types: 18650, 21700 Li-ion (3.7V nominal)
• Nominal pack voltage: 21.6–22.2V
• Max charge voltage: 25.2V
• Continuous current: up to 15A (charge and discharge)
• Protection: overcharge, over-discharge, short-circuit

Match every cell’s resting voltage and internal resistance before spot-welding or soldering the pack together, since this board does not balance the cells during use.