Canon A540 - Manual (Page 105)

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! 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 reduced usage time.
! At low temperatures, battery performance may be reduced
and the low battery icon (
) may appear earlier than usual.
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.