use 5 of those cells. unwrap it an take thelast of the cells out of the sequence. take the lead from that cell and solder it back on to the now last cell. wrap it back up and put a sticker on it. This will give you a 6v reciever pack. (5x1.2v=6v) you can charge it with anything that puts out about 7.5 to 8v. at no more then 1amp. and at 650mah youll be able to run it for a good amount of time before a recharge is needed.