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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