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This review is from: Power2000 1200Mah Lithium Battery Replacement For Canon NB-10L Battery (For Canon SX40 HS Camera) (Camera)At the time I was going to buy some spare batteries for my Canon SX40HS the Canon NB-10L batteries were around $60 each. These were rated at 920mAh. Imagine when I found the Power2000 batteries, rated at 1200mAh from Portable Guy for only $9.37 each. Three of them delivered to my door would cost me a little more than half the cost of the single Canon battery and they were supposedly higher capacity (by their 1200 mAh rating). I was very skeptical however I ordered them anyway. After using these for a couple months I have to say I am very pleasantly surprised if not shocked. I have never been able to shoot this many pictures with a single battery from a digital camera before and this camera is one big hunk of a camera. While I don't have a count of how many shots I get from this type of battery with this camera, suffice it to say I shot over 400 pictures at a wedding this weekend, about a 50% split between available light and flash and by the time I was finished shooting the battery indicator still showed a full charge. Bottom line is I went to the wedding with 3 fully charged Powercell2000 batteries and never made it past the first one. There's no question in my mind that this battery shots tons more pictures than the Canon NB-10L. I suppose the real question is how long this type of battery will hold up in the long run. Well, at a fifth the price, if it holds up for half as long it's still a much better deal. Couldn't be happier.