These INSTEN batteries for the Canon LP-E5 provide backup for my Canon XSi factory batteries, which seem to not hold a charge as long as they use to. The INSTEN batteries work equally well as the Canon factory batteries. For a while I was charging them with the Canon charger. Then a little bird told me that maybe I should purchase the associated INSTEN battey charger. Some Canon cameras/chargers are real finicky about using generic batteries. Now that I have the INSTEN battey charger, I feel I have sufficient battery power for those long photo days off-site.
At 2800mAh these batteries should give me about 7% more run-time than Canons 1865mAh batteries. They also cost roughly 1/6th as much. In addition to more power and less money, I get the knowledge that the two batteries belong together. It has always been a best practice to never mix rechargeable batteries of different ages. This has something to do with the older battery not being as efficient as when it was new. When you buy a two-pack there is the highest likelihood that they left the factory together and are the same age. Buying them in singles from any but the best supplier could mean that one has been on the shelf for months if not years, and it's mate may be just in from the factory. I typically buy straight Canon gear, but this time I'm going with a pretty standard piece. They do not go directly into the camera as I use a battery-pack grip. This means if they were to malfunction in any way but to experience a spike (which is most unlikely at best) they cannot hurt the camera, just the grip which is far less expensive. The only reason I could not give five stars is because with batteries time is the only true test. Once I've owned them for ten years like my Canon batteries in my other camera, I can weigh in on that.
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