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I left mine parked for 5 weeks while i was overseas on holiday.
The battery was fine and the car started on first crank of the starter motor.
So my guesstimate is it can last longer than 5 weeks.
The radio will automatically switch off after one hour , this is annoying at drive in movies because the start button has to be pressed every hour to keep the FM movie sound on.
So the radio can be used for at least 3 hours and the battery still starts the car okay.
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