What do you expected? It's absolutly normal, that it's less than 24 hours holding. Garmin specifies up to 18 hours, but you will never reach that, if you turn backlight always on.
With it turned off? As in press and hold the button until it shuts down? And 24 hours later battery is dead. No that is not normal. The battery should last months when off. Curious, charge it up, shut it off and remove the battery. Put it back in a day later and see. If dead, definitely a faulty battery. If not, possibly some parasitic draw from the unit for some reason or it is not actually turning off.
I have been using it every other day. I charge it up one day take the battery out the next morning when I use it I put the battery back in and it is still fully charged.If I leave the battery in the unit with it turned off it will run down. I am a dummy about these things but if I had to guess I would think something is running and draining it, but I don't know what I have turned a lot of the stuff off.
How long does it last when on? I know it varies a lot by how much backlight use, map orientation, etc but I think I get maybe 8-10 hours or so without worrying about it going dead. If it’s going dead over night, it sure sounds like it is not turned off. I’d fiddle with mine but I’m in the process of a painfully long update to a marine chart.
