It's by no means a serious charger but it sure beats a wall charger. The fancy ones sell for over $100. It takes about 3 hours to charge a dead 3600mah battery set at 1 amp. Sometimes I've set them at 2 amps and am done in 45 minutes or so.

They say you shouldn't charge the batteries more then three times in a day and should wait 45 minutes before using after charging.