Well purchased new auto with built in NAV system so didn't use 910 for a month or so. Tried to and it would not start. Hooked up to HOME and it showed battery charging and discharging so I figures Battery shot after 3 years. Messed around with it on Home ,not really knowing what I was doing and tried to restore program. To make a long story short I have it running again BUT I cannot turn it on unless it is docked and using external power (battery indicator shows full charge) and when I remove it from dock or power source I no longer get the count down to shut off. Prior to this All I had to do was plug it in and it came on and locked on satellites. What have I done and any suggestions on fixing it?