Canon A720 1S User Manual page 171

Before installing the batteries, wipe the battery terminals well
with a dry cloth.
If the battery terminals are soiled with oil from one's skin or other
dirt, the number of recordable images may be considerably
diminished, or the amount of time the camera can be used may be
reduced.
At low temperatures, battery performance may be reduced and
the low battery icon (
Under these conditions, restore the battery performance by
warming it in a pocket immediately before use.
Do not put the batteries into a pocket together with metallic
items such as a key ring.
The batteries may be short circuited.
When not using the camera for long periods, remove the
batteries from the camera and store them separately.
If the batteries are left inside the camera, the camera may become
damaged from battery leakage.
WARNING
Never use damaged batteries or batteries whose outer seal is
completely or partially missing or peeled off, as there is risk that such
batteries may leak, overheat, or burst. Always check the seals on
store-bought batteries before loading them, as some batteries may
come with defective seals. Do not use batteries with defective seals.
Never use batteries that look like this.
Batteries with all or part of the seal (electrical insulation
sheath) peeled off.
The positive electrode (plus terminal) is flat.
The negative terminal is correctly formed (protruding from
the metal base), but the seal does not extend up over the
edge of the metal base.
) may appear earlier than usual.
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Appendix