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Power Source Battery: [/FONT][FONT=Trebucht MS, Arial, helvetica]Battery: One 2CR5 lithium [/FONT][FONT=Trebucht MS, Arial, helvetica]
batteries supplies power to body and built-in flash. [/FONT][FONT=Trebucht MS, Arial, helvetica]With
Battery Pack BP-50: 4 Size-AA alkaline batteries or 2CR5 lithium battery. With Battery Pack BP-5B (with BP-50 battery compartment cover): 4 Size-D batteries.
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Battery Check: [/FONT][FONT=Trebucht MS, Arial, helvetica]Battery level displayed automatically indicating one of four levels on the LCD panel when Command Dial is unlocked. Battery level is indicated in one of four levels.[/FONT][FONT=Trebucht MS, Arial, helvetica]
Note: When the http://www.mir.SPAM/rb/photography/hardwares/classics/eos/eoscamera/EOS500nRebelGKiss2/powecell.gif symbol blinks on the LCD, a picture can still be taken except it may not be enough to advance/rewind the film. 
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Taken from HERE