RE: Home made Lithium Ion battery charger
one thing that hasn't been said (i don't think it has, anyway) is that li-ion packs such as cell phone packs and the cheap bulk rate ones, aren't high discharge packs. They are ok for small electrics that have low current draws (sub 5 amps) but if you try to use them in high amp applications you will smoke them and maybe your plane. That's the reason irate, etec, and the others can charge so much for their batteries...the $2 cells aren't rated for 7+ amps.