Canon IXUS 50 - Manual (Page 22)

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zDo not allow any metal objects such as key rings to touch the and
terminals (Fig. A), as this can damage the battery pack. To carry the battery
pack or store it during periods of disuse, always replace the terminal cover
(Fig. B). You may be able to check the charge state when Battery Pack
NB-4L is used depending upon how the terminal cover is attached
(Fig. C, D).
zEven charged battery packs continue to discharge naturally. You are
advised to charge the battery on the day of use, or one day before, to
ensure a full charge.
zSince storing a fully charged battery pack for long periods of time (about
one year) may shorten its life cycle or affect its performance, you are
recommended to use it in the camera until it is completely discharged and
to store it in an indoor location with low relative humidity and between the
temperatures of 0 to 30 °C (32 to 86 °F). If you do not use the battery pack
for long periods of time, charge it fully and discharge it fully in the camera
about once a year before returning it to storage.
zIf the performance of the battery pack diminishes substantially even when it
is fully charged, its life has been exceeded and it should be replaced.
Fig. A Fig. B Fig. C
Charged Battery Fig. D
Spent Battery
Attach it so the
is visible.
Attach it the
opposite way to
Fig. C.