Canon PowerShot SD790 IS Digital ELPH User Manual page 201

At low temperatures, battery performance may be reduced and
the remaining battery charge icon
earlier than usual.
Under these conditions, revive the battery by warming it in a pocket
immediately before use.
However, ensure that there are no metallic items in the pocket
that could cause a short circuit, such as a key ring, etc.
The battery may be short circuiting.
Do not allow any metal objects such
as key rings to touch the (
( ) terminals (Fig. A). To carry the
battery or store it during periods of
disuse, always replace the terminal
cover (Fig. B).
These conditions can damage the
battery.
You may be able to check the charge state depending upon how the
terminal cover is attached (Fig. C, D).
Fig. C
Charged Battery
Attach it so the
is visible.
You are recommended to use it in the camera until it is
depleted and to store it in an indoor location with low relative
humidity and between the temperatures of 0 – 30 °C (32 –
86 °F).
Storing a fully charged battery for long periods of time (about one
year) may shorten its life cycle or affect its performance. If you do
not use the battery for long periods of time, charge it fully and
discharge it in the camera about once a year before returning it to
storage.
(blinks red) may appear
Fig. A
) and
Fig. D
Spent Battery
Attach it the opposite way
to Fig. C.
199
Fig. B