Canon A420 - Manual (Page 88)

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z Before inserting the batteries, wipe the battery terminals
well with a dry cloth.
Oil from one's skin or dirtiness may cause a considerable
reduction in the number of recordable images or reduce usage
time.
z Battery performance deteriorates at low temperatures, and
the battery icon
may display more quickly.
If you are using the camera in cold areas and batteries are
running down faster than they should, you may be able to restore
performance by placing batteries in an inner pocket to warm
them up prior to use.
z Be careful that you don't put the batteries into a pocket
together with a metal key chain or other metallic objects, as
these objects may cause batteries to short-circuit.
z If you do not plan to use the camera for a long time, remove
the batteries from the camera and store them in a safe place.
Batteries may leak and damage the camera if left installed during
prolonged periods of non-use.
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.