Canon 155 A - Manual (Page 13)

Loading the Batteries
Use four new size AA alkaline-manganese
batteries (AM-3 or RL6) or four new Ni-Cd
batteries. Manganese batteries can be used
but will not last as long as alkaline-manganese
or Ni-Cd batteries.
1. To remove the battery chamber cover,
press and slide it off in the direction of
the arrow.
2. Load the batteries following the diagram
on the inside of the battery chamber.
If the battery poles are not facing in
the correct directions, the batteries may
burst and leak, causing damage to the
flash.
3. After having loaded the batteries, slide
the battery chamber cover back on in
the direction opposite the arrow while