Depending on the camera, it may or may not work properly.
But you probably won't hurt the camera.
No it cannot.
No, not unless you installed a 6 volt battery instead of a 12 volt battery.
The Canon film camera typically uses a 6-volt lithium battery, such as the CR123A or CR2 battery.
the device may not work
No, the camera needs 7 volts and will not operate correctly on only 5 volts.
A 12 Volt deep cycle marine battery.
The Canon AE-1 SLR camera operates on a 6 volt 4LR44 battery, or alternately four 1.5 volt LR44 batteries.
Common battery part numbers for this are ETX20L, YTX20HL, or YTX20L-BS. This is a 12 volt battery with the dimensions of 7X3.5X6.
No
if it is any think over 1 volt it is not a cell battery it is just a 6 volt battery if you had a 1 volt then it would be a cell battery
No, it will overcharge the 6 volt battery.
Yes, that is acceptable.