Canon PowerShot A300 User Manual page 119

This charger can be used only to charge Canon
AA-size NiMH batteries. Please do not attempt to
charge any other type of batteries with this 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.
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.
Since storing a fully charged battery for long
periods of time (about one year) can shorten its
lifecycle or affect performance, you are
recommended to use the battery in the camera
until it is completely discharged and to store it at
normal temperature (23° C / 73° F) or less. If you do
not use the battery for long periods of time, charge
it fully and discharge it fully in the camera at least
once a year before returning it to storage.
If battery usage time is considerably low despite
their terminals' being wiped and the battery
charger's indicator remaining lit, it is possible that
the batteries have reached the end of their
lifespan. Switch to different, unused batteries. If
you are purchasing new batteries, look for Canon's
AA-size NiMH batteries.
Leaving batteries in the camera or charger may
damage it causing battery leakage.
Remove batteries from the camera or charger and
store in a dry cool location when not in use.
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