Mophie iPhone 5s Battery Case
The iPhone 5s battery life is better than the iPhone 5 thanks t a slightly larger battery, but it won't last long enough for every user.
The Mophie iPhone 5s battery cases should work just fine, thanks to the same size and design as the iPhone 5. Mophie hasn't updated their website with the iPhone 5s branding yet, but we think they will work and we like multiple iPhone 5 battery cases they sell.
$79 to $119 at Mophie