Canon PowerShot S3 IS Advanced User's Manual page 146

The High-Power Flash will not fire in the
shooting mode when the automatic flash control is turned off
(p. 82).
The flash charge time will lengthen as the battery charge gets
weaker. Always set the power/mode switch to [OFF] when
you finish using the flash.
Be careful not to touch the flash window or sensor windows
with your fingers while the flash is in use.
The flash may fire if another flash is being used in close
proximity.
The High-Power Flash may not fire outdoors in daylight or
when there are no reflective items.
For continuous shooting, although the flash fires for the first
shot, it does not fire for subsequent shots.
Fasten the attachment screws securely so that they do not
loosen. Failure to do so may lead to the dropping of the
camera and flash resulting in damage to both.
Before attaching the bracket to the flash, check that the
lithium battery (CR123A or DL123) is installed.
To illuminate the subjects properly, install the flash so that it is
up against the side of the camera and parallel with the
camera's front panel.
A tripod can be used even when the flash is attached.
Batteries
Charge becomes Severely Limited
If the battery usage time has considerably diminished, wipe the
battery terminals well with a dry cloth. The terminals may be soiled
with oil from one's skin or other dirt.
Usage in Cold Temperatures (Less than 0°C/32°F)
Get a spare generic lithium battery (CR123A or DL123). You are
recommended to place the spare battery in your pocket to warm it
up before switching it for the battery in the flash.
Non-Use over Extended Periods
Leaving batteries in the High-Power Flash could allow the battery
fluid to leak, damaging the product. Remove the batteries from the
High-Power Flash and store them in a cool, dry place.
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