The Proton 4 is an easy-to-use Lipo and A123 balancing charger that provides a wealth of information about your battery packs. Charges packs with up to four cells wired in series, and at up to a 4 amp rate. The Proton 4 displays your pack's individual cell voltages, your charge time, the mAh that have flowed back into your battery, and shows how close your pack is to being fully charged with the Proton 4's "fuel gauge" reading.

Click here to see the user's manual.

Click here to see how you can use the Proton 4 to charge two 2S (7.4V) lipos at the same time!