This particular iPhone 7 battery case has a 3200mAh battery, enough to give you more than 100% battery life to your iPhone 7, which is equivalent to 4+ hours talk time and 10+ hours web browsing time.
Unlike Apple’s Smart Battery case, this particular case does not give you access to Apple’s Lightning port. Instead, it replaces it with a Micro USB cable for charging. What this means is there is no way to use Apple’s Lightning headphones with this case. This might not be a big deal if you’re using a pair of Bluetooth headphones, but if you’re not, you basically won’t be able to listen to audio while this case is on.
Owners seem to really love this product, with more than 400 owners giving it a 4.5-star rating. Not bad!