Just share a quick tip: the IS (Image Stabilizer) option in S90 is set to "Continuous" by default out of box. Meaning whenever the camera is on the IS is activated - this potentially could drain the batt faster. I set mine to "Shoot only" option.
Another tip: When u just wanna review/delete pics when not shooting, don't need to use the main ON/OFF switch everytime - the lens mechanism will keep extending/retracting which speed up wear n tear and also add to battery drain. Just press and hold the "play" button for 2 secs and the playback mode will be activated w/o the lens extending. Press "play" again to turn off the cam.
:thumbsup::thumbsup::thumbsup: Superb tip!