piperknitsRN wrote:
I just bought a Nikon 3100 and the battery life... seems to leave a lot to be desired. Unless perhaps it's me, I'm down to like, one "bar" of battery life (from fully charged) in about an hour and a half. I'm not sure why, as it seems it should hold its charge for awhile. Maybe using too much flash
The D3100 should be pretty good on battery. My D7000 is good for well over 1,000 shots between charges, and the D3100 shouldn't be too much worse. That would be at mostly daylight shots, with use of the rear LCD only occasionally to review pictures or set menus.
Of course, it's not the time which matters but the number of pictures you get out of a charge. How many pictures did you take in that hour and half?
Assuming the battery isn't defective, there are a few factors which will effect battery life significantly:
- As you've recognized, the flash eats batteries, probably more than anything else.
- Using the rear LCD screen reduces battery life, although not as much as flash. I had mentioned that in the other thread as a reason I prefer the top LCD screen on the larger Nikons. Reviewing pictures or accessing the menus will take energy.
- The autofocus assist light and flash preview (a/k/a redeye reduction or modeling flash) both use a lot of battery, and both are annoying. Shut them off unless you absolutely need them for a given shot.
- It takes energy to focus the lens, so if you're playing around a lot without actually taking pictures, that will effect battery life.
- Use of the USB cord to download pictures. The USB link seems to use an unusual amount of battery. That's why I always download from the memory using a card reader built into the computer.
- Insufficient charge time - you want to leave the battery in the charger for at least an hour after the charger stops blinking (or whatever your version of the charger does to indicate it's "done").
I'd also give the camera and battery a few charge cycles before you draw any conclusions. I'm not sure about the D3100, but I know the D7000 reads information from the battery and figures out how much life the battery has left. It needs a few cycles to "learn" about the battery characteristics before that estimate is accurate.