I was disappointed with my beastly original battery, there's just went too quickly. Even though I've hardly done anything, I sat on the bus and my battery was empty. Then I realized: I need a new one! Have many reviews read and I agree with everyone here in this product. While it invites very long before it is full, but it also keeps accordingly. I use my mobile intensive - whether Facebook, emails or various games Apps. With the new battery it holds nearly 2 days - and that's with smartphones already long I think :) Strong buy recommendation!