I have purchased aftermarket batteries for my Canon Xti, T1i, 40D and now 7D. I have never had an issue with them except one battery that would not take a charge and the seller sent me a replacement battery within a couple of days, no questions asked.The current set I have for my 7D are made by a company called Wasabi Power and I bought 2 batteries (Canon LP-E6), holders, an A/C charger and an ad