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Could be your tracker isn't designed to work with the different voltages and amps of rechargable batteries. Some products burn out fast if you do not use alkaline as they were designed to use. Rechargable AA does not equal alkaline AA batteries. The purpose of the laptop power via usb when off is to charge your phone which is designed to suck power especially when its pushed fast. I just dont think your gear is designed to work the way you want and its lucky the tracker still works.
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