Current Garmin GPS units do use flash memory, and thus don't require a
battery backup.
Older units like the GPS II+ have an internal lithium "10 year" battery
to maintain the memory contents when the AA batteries are removed.
This is probably non-rechargable, and is only designed to retain the
memory contents while the AA batteries are being replaced.
The GPS 12 manual states that it has an internal lithium battery; it
doesn't say if it is a rechargable battery, but also doesn't say that
you need to store the unit with fresh batteries either.
Unless you know that your unit has flash memory, you should always store
it with a fresh set of AA batteries.
--
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Paul Taylor Veni, vidi, tici -
I came, I saw, I ticked.
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