I am using either the 14-140 or the 100-300 with IS on, 50/50 mix of auto-focus and manual focus. 75% of the time I have the 100-300 mounted as I am photographing sports. I review maybe 10% of my stills (I rarely shoot video) but very briefly (less than a minute. A typical shoot is 2-4 hours and maybe 500 frames. I have begun to turn the camera off between events to extend battery life. That will put me one to two bars down on the Panasonic battery and exhaust the 3rd party battery (which we can dismiss as basically useless). I really can live with the battery life if I could acquire maybe two more OEM batteries to get me though a whole day. OEM batteries for this camera are backorderd every where I have looked (the usual suspects, my local dealer, B&H, Adorama, Panasonic web site).