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.
How to use lithium batteries safely: http://www.maxamps.com/lipo-care.php
More info on battery measurements: https://www.youtube.com/watch?v=cxkVxi9P0EA
Items you'll need:
Alarm circuit: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0...
http://www.google.com/search?q=dsp1a-l2-dc5v (select one of the distributors - price is around $5)
Music by Kevin McLeod and Löhstana David