Canon POWERSHOT SD400 DIGITAL ELPH User Manual page 173

'_ If the battery is used in cold regions (0 °C/32 °F or lower), you are
recommended to carry a spare lithium battery (CR123A or DL123).
Keep the spare battery warm in your pocket until immediately before
using it, and exchange it frequently with the battery in the flash.
,, Remove the battery from the flash and store it in a dry and cool
location if you will not use it for extended periods. Leaving it in the
flash could lead to the battery leaking and damaging the flash.
,, 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 affixing 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.
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