I purchased this PowerBear Samsung Galaxy S4 6000mAh Extended Battery & Back Cover & Protective Case (Up to 2.3X Extra Battery Power) - Black [24 Month Warranty & Screen Protector Included] as the battery in my Samsung Galaxy S4 was swelling and it was losing contact with the pins on the phone so it would always turn off or the battery would be all of a sudden dead and that was really annoying and inconvenient.  I saw this and usually I had to charge my old battery 3 or 4 times a day and with this one I can go 2 days without charging the phone after a full nights charge and that makes it very nice.  I use my phone a lot especially outside work so it is nice to be able to look at my battery life after a full days work and still see 90%+.  Even if I use the phone almost all day the battery still has life at the end of the day.  The screen protector that came with this phone battery and case fit perfect and was really easy to put on without any issues and doesnt cover anything like the speaker or mic.