fischertechnik Accu Set provides fast, reliable charging of your rechargeable NiMH battery (included). This high-powered NiMH Accu Pack also features a microcontroller to protect from overcharging. With this short-circuit protection, the charger is able to recharge your battery in two hours - at the most (8.4V, 1500mAh)! Keep your fischertechnik designs moving with the fischertechnik Accu Set.