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Hi.
A new back up battery will cost you about $2-3, so it is worth investing just to eliminate that as a cause of problem.
It is quite possible for the battery to read 40% and then after removing and refitting, jump to 70%, all batteries will "recover" some charge if left to rest for a while.
Also some battery testers do not actually measure the battery output but the voltage, this can remain at expected levels, although the power provided can be very low.
The Axim only has the two batteries you mention, the GPS or bluetooth will only take power from the back up if the main battery is empty.
Your GPS unit will also have a small battery in it that stores the GPS data for "hot fixes", This however is not replaceable and will not be causing a problem.
Check power drain on the GPS module and bluetooth, this can be upto 145mA. Depending on the GPS software you use, some system actually have an option to keep the GPS unit powered whilst the Axim is switched off. TomTom has this option.
I suspect the same for the bluetooth card. This function, should be set to off.
I would seriously change the back up, little cost for a lot of peace of mind.
Hope this solves the problem, good chance it will
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Drifter
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