With the Piranha, you can charge at 200mah or at 5 amps, whatever the battery can take. Curiously, Venom-Racing says to charge my batteries at 3 amps, 5 amps for peak performance, I did that once and it became very hot! I charge them at 1 or 1.5 amps. I use a few of the Heng Long Batteries to power my airbrush and guns when testing. These are charged at .5 amps.

The Piranha will tell you how much juice is in the battery when its done charging but by that time my kids have pulled the wires out or knocked it over so I never get to see it!