The Valken 8.4v - 9.6v NiMh airsoft battery charger is a smart charger for NiMh or NiCd batteries with 7-8 cells. The NiMh battery charger is easy to use, and charges airsoft battery packs at 600mA with a mini Tamiya connector. The airsoft battery charger plugs directly into a wall outlet, and a status LED lets you know when the battery pack is fully charged. The NiMh charger also comes with Delta Peak Detection, which automatically stops charging at a full charge, and switches to a trickle current of 200mA after 5 hours. They also come with reverse polarity and short circuit protection built in.