Batteries eventually fail, some more readily than others. I use my camera on a regular basis, especially during the warmer months, often on a daily basis. The camera had no problem recognizing the batteries and displaying their power levels reliably. The charger recognized them as LP-E6 batteries and charged them appropriately. As I said I did have one fail, but not until after a long time of repeated use, it simply won't charge now, and after charging for sufficient time it's not holding a charge. The price difference between retail of $** vs less that $** for an individual battery is a huge deal for me. With the original battery and two backups I could spend a lot of time, taking a lot of pictures when I came across a productive location, rather than having to stop and wait for a battery to recharge before I could start shooting again, missing who knows how many great shots.
You get 5 in the pack and it's affordable. We bought a single battery like this for over *** So far, the one in our scale (my husband uses EVERYDAY!) is still kicking strong.
My Canon 40D was purchased in 2008. The Canon factory battery is showing end of life signs. So, I purchased a set of INSTEN Batteries for Canon BP-511 batteries. These INSTEN definitely hold their charge much longer than the old Canon's. I have been using the Canon factory battery charger on the INSTENs. Just like with my XSi batteries, I think I better get an INSTEN BP-511 charger. Plus, it makes sense to have two chargers, trying to charge up 4-batteries for a photo shoot can take up a lot of time, when using only one charger.
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