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Just be aware that if you create a route on a different map to the one in your device you may not get the results you expect.
Ah true, missed that bit ..Seems clear that is not the case here, since he states "Everytime I start the engine it turns on automatically". That implies the power is off until the engine starts. :)
Certainly something isn't right. My Montana shows 100% after charging and won't switch off til the battery is depleted. With the supplied battery I was generally getting about 12 hours but as Boyd points out it depends on how it's set up.
They can be installed separately but you'll need to disable the Garmin ones, or remove them.
I believe you may be able to but it will need modifying as there is a switch inside which must be depressed. Probably easier to just charge them separately.