Canon A550 - Manual (Page 87)

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Reading images from memory card is slow.
Memory card was
formatted in another
device. z Use a memory card formatted in
your camera (p. 25).
Battery
Batteries consumed quickly.
Batteries are not the right
type. z Use only unused AA-size alkaline
batteries or Canon AA-size NiMH
batteries (p. 91).
Battery capacity drops
due to low ambient
temperatures. z If shooting in a cold location, warm
the batteries such as by placing
them in your pocket before using
them.
Battery terminals are
dirty. z Wipe the terminals well with a dry
cloth before use.
z Reload the batteries several times.
If using Canon AA-size NiMH batteries
As the batteries have not
been used for over a year,
their recharging capacity
has decreased. z Their charging performance should
return to normal after fully
recharging and depleting them over
several times.
Battery life has been
exceeded. z Replace both batteries with new
ones.