The battery is slightly thicker than the original battery. Unable to use the original hull to close the phone. The shell comes with the battery is made for that, she starts in place of the original hull. The result is a slightly thicker phone with a flat back. Everything is the same level as the rear base, which was slightly prominent before. I use a silicone protection that covers the entire back of the phone, it remains usable without force, even if we feel that it is tighter on the inside. I do not care. In the end, so I have a slightly thicker phone a bit heavier too, but still lighter than an iPhone, and with a battery that takes much longer, the same day without problem with a significant use, which was not the case before, which does not seem to heat more than the original battery. So good product, I am satisfied for the moment, and reassured by the fact that it is a battery manufactured by the phone manufacturer, not a generic random quality.