But while the iPhone 6 Plus is still relatively new and has an improved battery over the previous iPhone versions, even the best smartphone battery can always do with a little extra help.
There are many options available to elongate the battery life of your iPhone and the best options are replacement batteries, which are easy to change and convenient to use. Here’s the best battery for iPhone 6 Plus in the market. Alternately, you can also buy battery cases for iPhone 6 Plus to help extend the iPhone's battery.
Checkout bellow video of GerryRigEverything instructions on how to replace the iPhone 6 Plus Battery.