12V 3S 7P 40A BMS Li-ion Battery Pack DIY Kit – Case & Holder For 18650 Cells (You Pick)

Building your own 12V battery pack from 18650 cells?

This DIY kit has you covered.

It includes a case, holder, and a 40A BMS (Battery Management System) for a 3S7P configuration.

That's 3 series, 7 parallel—21 cells total.

It's designed for Li-ion batteries.

You supply the cells, and this kit gives you the structure and protection.

Great for custom powerwall projects, ebikes, or whatever you're building.

A solid base for a reliable pack.