[. . . ] * * * * * Corded type charger with AC100-240V adaptor Charge 1 to 4 pieces of AA or AAA rechargeable batteries Charge NiMH batteries only Equipped with 4 individual charging channels Termination methods -Individual minus delta voltage (-dV) -Individual temperature sensor -Individual safety timer Over - temperature protection Primary and damaged batteries detection 4 dual colour LED indicators Ventilation fan Safety guaranteed Charge either 1 to 4 pieces AA or AAA NiMH batteries. [. . . ] For the best performance and safety, charge only GP NiMH batteries with GP PowerBank U-Smart. For brand new batteries, 2 to 3 times of charging and usage cycles are required to optimize the batteries' performance. If batteries are stored for more than one week, always recharge them before use. It is normal for batteries to become hot during charging and they will gradually cool down to room temperature after fully charged. For best result, use GP PowerBank U-Smart at room temperature with good ventilation. Remove batteries from the electrical device if the device is not going to be used for a long time. [. . . ] Förvaringstemperatur för batterierna: -20 till 35°C Laddningstemperatur: 5 till 45°C [. . . ]