The Traxxas 2972 EZ-Peak is an efficient battery charger with up to 100W of power capacity. Once you put in any Traxxas battery, it will automatically configure itself to charge most efficiently. This device is capable of charging NiMH or LiPO batteries. The integrated cooling fan helps to avoid overheating of batteries or the charger itself. The charger has an LED progress bar with an alert system, so you will know when your battery is ready.