After a few weeks of use I can confirm that this is more than good! If you need a new battery gsm look no further, this is it for you! Upon receipt I charge the battery the time required for full charge, and my mobile phone held up almost 4 days! Awesome! I feel like a new gsm so it takes a long time. I recommend this product which is perhaps a little more expensive than other similar products, but (I have seen it myself before buying) has only positive comments THAT !!! And thank you to Amazon for its fast delivery service! Great!