Duracell POWERPACK300 Owner's Manual page 25

Recharging with the AC Charger
The Battery Status LED changes from red to green when
charging is complete (about 24 hours if the battery is
completely discharged).
Important: The 24-hour charging time for the Duracell®
Powerpack assumes that there is 120 V AC at the AC wall outlet.
If the voltage is less than 120 V AC, it may take more than 24
hours to fully recharge the Duracell® Powerpack. If, after 24
hours of charging, the Battery Status LED remains red, continue
to charge the unit for another 12 hours. The unit will be ready for
use even if the Battery Status LED remains red.
Important: If you keep the Duracell® Powerpack in storage, the
battery will self-discharge over time. Remember to recharge the
battery every three months to keep the Duracell® Powerpack
operational.
Note: Once fully charged, the charging current automatically
reduces to a maintenance charge mode, and the Duracell®
Powerpack may be left permanently connected to the AC charger.
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