This battery Weiss gave me great satisfaction. It is perfectly fulfills the role of booster battery. She held a week and +/- 1200 clichés.
Now she is loaded and stored in my camera bag in case of inadvertently I ran out with my Canon battery.
I think that Weiss battery will have a life span shorter than a widely Canon battery 70. But if you are looking for a safety or booster battery, Weiss sufficient. And has an extremely unbeatable price. I advise, is an unpretentious battery, but at least there is no risk of hitting a false canon battery produced in China.