In these batteries is powerful nickel-metal hydride batteries with a capacity of 1000mAh at a voltage of 1.2 volts. The Varta batteries can be charged with any standard charger, but with quick chargers. These batteries can The great advantage of NiMH batteries compared with conventional alkaline batteries is that these constant voltage (1.2 volts) maintains over the entire period of use. Alkaline batteries, however, work initially with a voltage of 1.5 volts, but lose that over the period of use. Who powerful and convenient rechargeable batteries examined for this are likely to be quite interesting. I am very happy with the battery and can recommend them!