[. . . ] Use to charge the battery pack without having the printer connected to an AC outlet. [. . . ] WARNING Never use the battery charger with any other battery pack except the specified type. Doing so can rupture the battery, or cause leakage, fire or electric shocks. Do not use wet hands to replace the battery pack or to unplug the battery charger. The battery pack can be recharged about 300 times (when used at normal temperatures). If the battery pack is fully charged but runs out quickly, replace it with a new battery. 5 hours for a fully discharged battery pack to return to a fully charged state. [. . . ] If the battery pack is fully charged but runs out quickly, replace it with a new battery. [. . . ]