i have a digital camera and it has a BP70A 3.7V 740mAh battery. How long does it last for?
That battery is used by a wide range of Samsung cameras: TL105, TL110, TL205, ES65, ES70, SL50, SL600, SL630, ...
Your mileage might vary a bit depending on the specific camera.
In general though, you should be able to take a few hundred shots on a full charge. Things that drain the battery much faster are using the LCD screen a lot (eg. constantly reviewing images, or taking a long time to compose shots) and using the flash a lot.
And rechargeable batteries do deteriorate over time... same with the battery in your laptop, phone, mp3 player, etc. After a few years they just don't hold their charge as well. When that starts to happen you can simply buy a replacement battery.
Or if you're constantly running out of juice, buy a spare battery now. I always carry around an extra battery (charged) plus extra memory card (empty), just in case.
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