Bests & Worsts Reviews from Amazon

I have purchased off-brand batteries in the past as second batteries for my cameras. I was particularly satisfied with Opteka ones. However, for my new Canon EOS 7D Mark II I just didn't want to take any chances. Additionally, if you look at it through the lifetime of the battery (for me, 4 - 5 years) the price differential only amounts to a few dollars a year. Yes, the Canon batteries are VASTLY OVERPRICED - but what are you going to do? Their batteries are far less likely to have any problems and are recognized by the camera so you can also see the remaining charge level while using them and don't get a surprise with a dead battery just in the middle of shooting something important. UPDATE: These are Canon's worst batteries EVER! They do not hold a charge nearly as well as the batteries they are replacing. I got 1 with the camera and added a spare to switch out with. One has completely died after only a few rechargings - less than 30. This is a replacement for the Canon LP-E6 battery - which will work in the same applications. The older LP-E6 was excellent - the newer LP-E6N is worthless.