i don't mean to thread crap, but i've found that these generic replacements are pretty low quality. i got one of sterlingtek's nb-1l batteries for my s100 and it only lasted about 20 minutes between charges. i had it replaced , but the new one only lasted around 40 minutes. the low battery indicator comes on soon after turning the camera on. i realize these aren't very scientific statistics, but the real canons do seem to last a lot longer. i'd pay the extra few bucks for the canon ones. my 2 cents.