Using The Power Kits; Using Rechargeable Batteries - Canon POWERSHOT S2 IS User Manual

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_, efore 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,
Included are the battery charger and four rechargeable AA-size NiMH
(nickel metal hydride) batteries. Charge batteries as shown below.
_. Charge Indicator
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