I have only had the batteries for a short time, but they are working great. I have recharged all three sets "4 per set" three times each. (that's what taks to run my Canon PowerShotS2/I2 camera)all good news.I take a lot of pictures and I need 3 sets to keep me going for about 6 hours.But I know that I need another 3 sets to really keep me in the field for the day. I do alot of back packing and long walks on the beaches.These batteries are really good they have never let me down as of yet, that's why I will be getting more. All I can really say is byem.