Thought I was getting a good deal on these. Noticed erratic performance, so I replaced my charger. Turned out some of these batteries would only hold a charge for a few hours. I threw out the "bad apples", thinking that only a few were defective. (I had purchased several packages of these.) Big mistake. I should have returned them all.Over the next few months had more failures, even with the batteries that had previously tested OK. Some of these failures took place at very bad times, costing lost work and time. Eventually, they damaged an expensive camera, which had to be repaired at the factory.I have since replaced all of them with Sony brand batteries, which seem to be OK.