Audiovox PPC6600 - Manual (Page 15)

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Section 1: Getting Started
Data Retention
It is vital to keep your battery charged. Because your PPC6600 does
not have a hard drive, all data and any new programs you install are
stored in RAM. If the battery completely drains, any data or new
programs you installed will be erased. Only the default programs
on the device when you bought it will remain.
To prevent this kind of data loss, a portion of the main battery has
been set aside to keep your data safe for up to 72 hours if your
device runs out of power. An additional battery, the backup battery,
is designed to keep your data safe when you remove the main
battery. It will keep this data safe for up to 20 minutes.
Note: Verify that the backup battery power remains at least 50% OR ABOVE before
you remove the main battery. This can be checked by tapping
> Settings > System tab > Power.
Recharging Your Device
To recharge your PPC6600:
 Place your PPC6600 in the cradle and connect the cradle
to an external power source with the AC Adapter. Before
using your PPC6600, charge the battery for at least 8
hours for the first time. Then, place it in the cradle for a short
time each day to recharge it to its full capacity.