I bought this battery to have as a backup for the identical one that came with my Canon Powershot G5. The battery is fabulous. I've always been very displeased with the shooting capacity of digital cameras in general - they would run out of battery in a very short time. This battery was one of the deciding factors for me buying a Canon Powershot G5. According to a test on dpreview, it's the best performing battery (when used in the G3) out there for any digital camera (at the time of testing).
I've taken a few thousand pictures with it so far, and I'm very pleased. When using the LCD display for a mix of movies and pictures (on my G5), I get around 600 pictures out of one fully charged battery. I've never completely "emptied" the battery with the LCD screen off (preview only), but based on my experience so far, I would think that you'll get somewhere between 600-1000 pictures out of one fully charged battery - maybe more - when the LCD is not on all the time. If you take a lot of pictures (I can easily take 500 on a weekend trip), I would still recommend buying an extra battery though. I'm panicked about ever running out of battery (or memory) while I'm shooting.

Should you buy a cheaper non-Canon brand equivalent battery? I've not tried an equivalent for the BP-511, but I've got a DigiPower equivalent for my Canon Powershot S200 (Elph II), and it's crap. I would never buy and equivalent for my G5 camera, because in my experience, it's quite apparent that you get what you pay for.

Pros:
* Extremely good capacity - 500-1000 pictures on one charge with normal use.
* Charges relatively quick in my G5 - about 90 minutes
Cons:
* Very heavy. It'll weigh down your camera, but for the capacity it provides, I personally think it's worth it.
Conclusion: It's a very good battery - capacity is fabulous. I've had no problems with it - it doesn't overheat, it doesn't stop working, and so far after about 6 months of operation, I've noticed no drop in capacity. I give it an unconditional 5 stars!!!
See more reviews about: Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders
Canon BP511A 1390mAh Lithium Ion Battery Pack for Select Digital Cameras and Camcorders

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