Duracell POWERPACK 600 Owner's Manual page 37

Battery Maintenance
If' . .
CAUTION .
~
Due to inherent self-discharge, lead acid batteries must be
charged at least every
3
months,
especially in a wann
environment. Leaving a battery in a discharged state, or not
recharging every 3 months, may result in permanent battery
damage and poor jump-starting performance.
If' . .
CAUTION
~
Do not attempt to recharge the Duracell® Powerpack battery if it is
frozen. Gradually warm the frozen battery to 32
OF
(0 °C) before
recharging.
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