3S 40A 18650 Li-ion Battery BMS Protection Board – Balanced Charging PCB

Need a solid BMS for your 18650 build?

This is a 3S (that’s 3 cells in series) 40A board with balancing function.

Keeps your lithium-ion pack from overcharging, over-discharging, or shorting out.

It’s an unbranded board, but it does the job—manufactured in China, works for a ton of DIY projects like e-bikes, power tools, or solar setups.

No fancy retail box, just the board itself, but it’s brand new and untested.

If you’re building a battery pack and need that safety layer, this is the part.

And yeah, it’s got the standard balance leads and everything you’d expect from a generic but functional BMS.