Canon A-1 - Manual (Page 35)

Checking the Battery
Life of ihe battery in normal use is
approximately one year. Using the camera
frequently at low shutter speeds, at the “13”
setting or in extremely cold conditions lakes
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
main switch 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
stored for an excessively long period of
time.
6. When the camera is used in extremely
cold conditions.
To check the power level of the battery, first
set the main switch to the “A” position. It