Originally Posted by rushmore
I have the Hyperion 5200 with protective case. Had the same type of extended from the same company for my S3 for almost a year and worked great. Battery life was doubled for the S3 and appears the same for S4. $40 for the battery and case.
I also use the Hyperion 5200 in my S4 after having a good experience with their battery in my old S3. This battery definitely eliminates the the worry of the phone going dead at inopportune times. With normal usage, it will last through a weekend.
Now I am looking for a good protective case to fit with the extended battery.