UNU Galaxy S5 Battery Case
The UNU is just like the TYLT. Matching the 2,800 mAh internal battery with a second 2,800 mAh battery essentially doubling the Galaxy S5 battery life. It is an integrated design that differs from the two previously mentioned options, but works a similar way in which the case has the extra battery and is delivered to your phone.
This is one of the slimmest options, comes in six colors, and is a decent price.
UNU Battery Case - Buy for $49.99
As an Amazon Associate I earn from qualifying purchases.