Rechargeable batteries are the optimum energy source for equipment with high consumption of electricity (digital cameras, flash lights, electric powered tools, toys, musical instruments and industrial power systems).It is important to protect the battery from over-charging. Ansmann chargers use a microprocessor controlled - delta V circuit. A safety timer is always included with Ansmann chargers. Some of the chargers also have a battery temperature monitoring (Tmax). As soon as the battery is full capacity, the charger switches automatically to trickle charge. As an extra specialty, the Energy series all include an automatic refreshing function. Even though their models may vary in design and capability, some features apply to all the chargers: an outstanding functionality, easy operation also comes with a 3 year warranty. Batteries not included