I have a Trition Jr that I really like. You need a seperate 12v power supply at home (unless you want to charge at the car in the garage). Works GREAT at the field to recharge a spare flight battery while you fly another pack (or charge a spare transmitter pack).

I fly 4.8v 1450 mAh packs (sometimes two) and use 1600 mAh transmitter packs.

The Hobbico Accu-Cycle works, too. I used one of those for six years and it still does the job. Just not quite as well as the Triton Jr.