I have had mine stay on several times. No apparent reason.
If I hit the bottom right button at any time it powers up also.
I've never had a dead battery that I could attribute to it though.
I *assume* that a SGII doesn't draw all that much.
How long was the car off before you were unable to start it?
Good test is to put an amp meter in line with the battery and turn on the SGII alone to determine draw with and without it "on".
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2016 Tesla Model X
2022 Sprinter
Gone 2012 Tesla Model S P85
Gone 2013 Nissan LEAF SV
2012 Nissan LEAF SV
6 speed ALH TDI Swapped in to a 2003 Jetta Wagon
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