5S 20A Li-ion Battery Protection PCB Board With Balance – For 18650 Battery Packs (18.5V)

About This Product

Building your own 5S lithium battery pack?

You can’t skip the protection board.

This little PCB handles all the safety stuff—overcharge, over-discharge, short circuits—and it’s got a balance function to keep all your cells happy.

Rated for 20A continuous current, so it’s solid for most DIY power tool packs, e-bike batteries, or portable power stations.

It’s designed for 5S Li-ion setups, meaning 5 cells in series for a nominal 18.5V.

Works great with 18650 cells.

The board is brand new, made in China, and comes as you see it—no branding fluff, just the board you need.

No UPC, no fancy MPN, just a straight-up functional BMS.

If you’re assembling cells, this keeps your pack from exploding or dying early.

Compact, reliable, does the job.

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