I went on a google search for reviews on the 4300 mah Mpj S5 extended battery. I would see 1 posts here and there backing up or making these positive claims. Then I realized it's either a person working for MPJ trying to promote the battery. I did see a senior member's review, maybe I just got a defective one? I'm glad I bought it on ebay because of the money back guarantee. I have screen shots and people can't pull shady deals like return the item but pay for shipping kind of stuff. I'm using the OEM Samsung 3500 mah extended battery now.