It doesn't take much for your camera's battery to fade, even if you started with multiple, all fully charged. If you're running on empty, either because it's been a long day or you just forgot to pack a backup, these tips will help you make the most of the charge you have left without sacrificing your photos.
The video itself is from the folks at SLR Lounge, always a good resource on better photography. Some of the tips might come off a little obvious, like disabling camera stabilisation when you don't need it, or when you can compensate for having it off. Turning off sensor cleaning every time the camera turns on and off is another way to save a little power -- just remember to turn it back on when you're charged up. Many cameras also allow you to disable unnecessary features with a quick settings tweak, like Sony's mirrorless cameras that have a kind of "aeroplane mode" built into them that will help you conserve battery.
For a less drastic measure, you can turn off image preview, where your photo is displayed on the LCD after you take a shot. That way you can just take your shots and review them later instead of letting your LCD turn itself on and stay on while you're actually taking pictures. While you're at it, consider turning your LCD brightness down for the time being. Those are just a few options, so hit play for more, or check out the links below to watch the video at YouTube.