Canon POWERSHOT D20 User Manual page 57

Charge the battery on (or immediately before) the day of
use
Charged batteries gradually lose their charge, even when
they are not used.
You can easily check the charge
state of the battery by
attaching the cover so that A is visible on a charged battery,
and attaching it so that ,A is not visible on an uncharged battery.
Longoterm battery storage
After using up all remaining battery power, remove the battery from the camera.
Store the battery with the cover attached. Storing a partially charged battery over
extended periods (about a year) may shorten its life or affect performance.
Using the battery charger abroad
The charger can be used in areas with 100 - 240 V AC power (50/60 Hz). For
power outlets in a different format, use a commercially available adapter for the
plug. Never use an electrical transformer designed for traveling, which may
damage the battery.
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