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Get more bang for your buck. Bastens charger upgrade not only charges your stock battery faster but also provides a voltage display (total and per cell) for advanced users to help verify the status of your battery. No more guessing when the battery will finish charging. Watch the voltage display; as the voltage gets closer to 4.20 volts per cell you know the charge is almost complete. Includes a PCM (Protection Circuit Module) which protects the battery against over charge; over discharge and short circuits.