Attributes

Brand	-
Category	Electronic Components / Maker DIY / Development Boards & Control Boards
Origin	-
Cell Series Configuration	5S (5 Cells in Series)
Nominal Voltage	21V (18V - 21V Range)
Max Continuous Discharge	30A
Protection Features	Overcharge, Overdischarge, Overcurrent, Short Circuit
Compatibility	Makita-style 18V/21V Tool Batteries
Balance Function	Passive Cell Balancing
Operating Temperature	-20°C to 60°C
PCB Dimensions	60mm x 40mm x 5mm
Weight	25g
PCB Material	FR-4 Fiberglass

5 reviews

Anonymous

Apr 07, 2026

Rating: 4/5

Good but instructions vague

Board works well but wiring diagram could be clearer for beginners.

Anonymous

Mar 30, 2026

Rating: 5/5

Solid protection

Tested the cutoff voltage, it's accurate. Good build quality for the price point.

Anonymous

Mar 09, 2026

Rating: 5/5

Reliable BMS

Been using it for 3 months in a custom pack. No issues with balance or cutoff.

Anonymous

Feb 19, 2026

Rating: 5/5

Fits Makita casing

Dimensions are spot on for the replacement shell I bought. Highly recommend.

Anonymous

Feb 01, 2026

Rating: 5/5

Perfect for custom packs

Works great for my DIY drill project. Soldering points are clear and easy to work with.

5 FAQ

Q: What is the idle current consumption?

A: Typically less than 50uA in storage mode.

Q: Can I use this for LiFePO4?

A: No, this is calibrated for standard Lithium-Ion voltage ranges.

Q: Does this support 18650 cells?

A: Yes, designed for 5x 18650 lithium-ion cells.

Q: Is there a balance wire included?

A: Wires are not included, you need to source your own balance leads.

Q: Does it have a temperature sensor?

A: This model does not include an NTC temperature sensor input.

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