I just now noticed that every last file of my GT680W can't be open and view.
I tried all the media software on my computer, and they all say that the file is corrupted or that they can't read its format.
There is a way to watch these videos, or is it a lost case?
If you have one important MOV movie i think you can fix it.
Otherwise like said, your dvr battery is finished and every last file will be corrupted because they are not closed properly.
If gt680 has option to shut down camera immediately try that, i don't remember what kind of menu options gt680 has.
Otherwise you have to replace dvr battery.
It is proberly a 1 cell lipo battery 3.7 volts, the problem is how large it can be in size.
nico will most likely know if there is any problems taking a GT680W apart.
Look like its easy to take apart to get at the battery,
Be advised, just becuz the battery seem to be a 110 mah one there can be different sizes of them, so it will be wise to take it apart to mesure the original battery though it might be swollen up some.
lipo batteries all tend to swell up in size when they die, but to my knowlege its mostly the thickness that will suffer by that.