i bought this product for my cannon SX1 camera, and have found the batteries to have an excellent charge life. they can take more than 2100 jpg's at high resolution before the "change batteries" message flashes up on the LCD screen. on re-charging them, you can either do all four at the same time (this takes up too three and a half hours) or you can do two at a time (this only takes about 1 hour) so that way you save about one and a half hours on the re-charge for all four batteries. this charger WILL NOT RE-CHARGE ALL FOUR BATTERIES IN I HOUR, THIS ADVERTIZED TIME IS FOR TWO BATTERIES ONLY. this is a marketing ploy so be aware of expecting it to do something it can't. otherwise this product is highly recommended.