Canon AV 1 - Manual (Page 29)

Checking the Battery
Life of the battery in normal use is approx­
imately one year. Using the camera frequently
at slow shutter speeds (small apertures), at
the “B” setting of the selector dial or in
very low temperatures takes more battery
power and requires replacing the battery more
often. The battery requires checking under
the following circumstances:
1. When a new battery is loaded.
2. If the shutter will not function when the
shutter button lock lever is at “A”.
3. When long exposures are frequently made.
4. When the camera is used very frequently.
5. When the camera is used after it has been
1 7