Elongating the life of your iPhone's battery is a dream that every Apple device user has. With the rampant use of applications and phone functionalities, it is next to impossible to keep the battery for iPhone 6 powered through the whole day. But when you are too busy to sit next to a wall socket and wait for you phone to charge, a battery case can come in handy.
Battery cases are great for 2 reasons - they will increase the phone's battery life, and also keep it completely protected.
With the case frame of battery cases, they have a hard outer shell that keeps the phone protected from all sides and averts accidental dents and scratches, all the while charging your iPhone when necessary. This also reduces the cumbersome need to carry wires and chargers around with you!
Here's a list of some great battery cases for the iPhone 6. Alternately, you can also have a look at replacement battery for iPhone 6, incase you wish to change the original battery.