Canon PowerShot A310 User Manual page 109

This charger can be used only to charge
Canon AA-size NiMH batteries NB-2AH.
Please do not attempt to charge NB-2AH
batteries in any other type of charger.
Never mix new batteries together with
batteries that have been used in other
devices.
When recharging batteries from the
camera, always recharge both of them
at the same time.
Do not mix batteries with different
purchase dates or different charge
states.
Do not attempt to recharge fully charged
batteries, as doing so may reduce or
impair battery performance. Also, do not
charge batteries for more than 24
consecutive hours.
Do not recharge batteries in enclosed
areas that tend to retain heat.
Repeatedly recharging batteries before
they become fully depleted may cause
batteries to lose capacity. Do not
recharge the batteries until the LCD
monitor displays the "Change the
batteries" message.
Appendix
Wipe the battery terminals well with a
dry cloth in the following situations, as
the terminals may be soiled with oil from
one's skin or other dirt:
- If the battery usage time has
considerably diminished.
- If the number of recordable images
has considerably diminished.
- When charging the batteries (insert
and remove the batteries two or three
times before charging)
- When charging completes in a matter
of a few minutes (the battery charger
indicator remains lit)
You may not be able to fully charge the
batteries due to their specifications right
after purchase or after long periods of
non-use. If this happens, use the
batteries until their charge is depleted
before charging them again. After doing
this several times, battery performance
will be restored.
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