I have a Delorme PN60 mounted and a Shorai bike battery. I forgot to unplug the unit from the bike for 2 weeks and the battery was (2.5V) dead. incapable of recharging. This battery is 2 years old and I sent it back to Shorai to run tests on. They found it was a slow draw of current that killed it and they offered me a new battery at a heavy prorated price. Hip Hip Hurray to Shorai for stepping up to the plate.
Bottom line is; always unplug the GPS, if even for 1 night.
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