[Chadworkz]

I took 8 of the little light blue LG Lithium-Ion 3.3v 1200mAh batteries out of 8 of my old LG cell phones and made a 4S2P pack (13.2v @ 2400mAh) out of them that is very light, has great power & capacity, and works awesome in my Profile (Foamy) R/C Air-Planes!

I charge it at 4.8 Amps (2C) with no problems and no over-heating, and it charges in about 15-20 minutes. I fly the plane until it starts to hesitate instead of being snappy and then bring it down for a recharge.

I am collecting batteries from everyone's old cell phones and will soon have 8-10 awesome (FREE) Li-Ion battery packs that are perfect for my Foamies! The only bad thing is, you can't run them in a car or truck, unless it is 1/24 scale or so (which I am building a 1/24 scale Jeep Wrangler Crawler powered by 2 of the Li-Ion cells "2S1P 6.6v @ 1200mAh"), because they just don't have the output-current required by larger cars and trucks.

If you want to use the technology in a big car or truck, where full-discharge and/or over-charge won't hurt the cells, and you don't need a balancer or anything, get LiFe-Po/Li-Fe (A123) cells...they are great for large 1/10 & 1/8 vehicles!