Down at the bottom of the header is a site called Watt Flyer, that's where I went when I built my electric and it's worth going there. I went Lipo and charge them in a fire proof container right next to me while I'm watching TV or reading. The charger I'm using beeps to let me know when the battery is charged. Problem is my hearing isn't all that great but my wife hears it before I do. I know of several charging accidents that have happened to friends so I'm very careful with them.