6S 22V 18650 Lithium Battery BMS Protection Board

This 6S Battery Management System (BMS) board is designed for drone builders assembling custom lithium-ion packs for long-range, endurance, or cinematic FPV platforms. Built for 6-cell in-series configurations using 18650 or 21700 cells, the PCB actively monitors voltage levels to keep your custom power solutions safe from electrical faults.

Key features

• Prevents permanent cell damage with built-in overcharge and deep-discharge detection.
• Integrated short-circuit protection guards against wiring faults and field damage.
• Low-profile PCB footprint allows for seamless, flat integration under battery heat shrink.
• Optimised for nominal 22.2V lithium chemistries.

Specifications

• Supported configuration: 6S (6 cells in series)
• Supported cell types: 18650, 21700 (Lithium-ion / LiPo)
• Nominal pack voltage: 21.6V - 22.2V
• Maximum charge voltage: 25.2V
• Protection features: Overcharge, over-discharge, short-circuit

When assembling your pack, ensure all individual cells share identical internal resistance and resting voltage levels before spot-welding and soldering to the BMS pads.