I fully charge my s4 at night from about 9-6am. Normal use will get me to 9pm again with about 20% remaining.  This is usually about 3 hours streaming,  2 hours reading (those together), some normal calls, 10 texts. Original battery would not make it past 3pm or so. Also provided case is easy to hold and seems  to  provide  good protection. Added 11/27. I now have another of these batteries so that I have two to take camping therefore I won't have to worry about charging. They do last a long time as noted above however with the new battery they recommend this recalibrating process by which you charge to 100% And then take it down to zero then back up to 100% Etc every so often I'm going to try doing that every 6 weeks to see what happens. I still really like these batteries