How to Make a Battery Protection Circuit (over-discharge protection)

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In this video I will show you how to build a simple lithium battery protection circuit, so you can power your homemade projects without ever worrying about over discharging your battery.


Circuit diagrams:


How to use lithium batteries safely:


More info on battery measurements:



Parts links:
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Alarm circuit:

Relay: DSP1a-L2-DC5V


(select one of the distributors - price is around $5)

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Music by Kevin McLeod and Löhstana David