More than that! keeping it plugged into the car is damaging the SIIRF chip and battery when you start the motor. Also the unit needs to be charged properly before use in an AC charger or vIA USB The DC in the car will not fully charge the unit. In fact it also leaks power back to the battery of the car when you turn ignition off, so dropping the volatage and amps of the battery in the GPS.
ALWAYS UNPLUG BEFORE STARTING ENGINE
Always charge/recharge it prior to use in a AC or USB environment
Battery life is average 2 years unless used like you say you have. Then 3-6 months might see it collapse!
try a full and proper recharge first
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