I recently began using these in my Canon digital camera for covering events for Off-Road.com. I had at first not believed the packaging saying that they last 8 times as long as a normal battery but I was stunned to go two whole days without swapping in a new set of batteries after going through about a set every hour on previous occasions. I shot literally hundreds of photos and scores of 20 second long videos at the event and the batteries would not quit. I can now carry four of these batteries for my camera for an entire weekend of shooting and not worry about running out of juice instead of lugging around a full 16 pack or more...Its quite the weight savings and organization upgrade. Additionally, these batteries work at extreme temperatures which is a big deal to me for shots taken in my New England winters and Desert events. All around they are well worth the addtional price.