HP Photosmart A310 Compact Photo Printer - Manual (Page 17)

When the battery power is low, the On and Attention
lights flash. When the battery charge is completely
depleted, the printer will shut down and any print jobs
that are in progress will be cancelled.
To recharge the battery, leave it inside the printer and
connect the printer to an AC power source. If the printer
is turned on, the On light slowly flashes green to indicate
that the battery is charging. The printer does not need to
be turned on to charge the battery.
The battery should fully charge in approximately four
hours when the printer is not in use. The first time a
battery is charged and when the battery has been fully
discharged, it could take up 12 hours to recharge.
Note If the printer is operating solely on battery power,
it automatically shuts down after 8 minutes of inactivity
to conserve battery power.
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