the iPhone 6 battery made my pone impossible to use.
following the steps in the replacement guide was easy. There are two guides, 1. Opening the phone and 2, replacing the battery, then follow the instruction for tack 1 in reverse, which there is no reverse instructions. A single guide for some users would be better.
Removing the tape strips on the battery by pulling is next to impossible. I followed the instructions exactly and both tape strips broke, leaving me to "hack" my way into prying the battery up slowly on the left side and cutting the tape underneath. the battery is not rigid like you would expect, so any prying must be done very carefully.
1. you do NOT have to remove the entire case to remove the batter, as long as you can get the tape strips out the first time. So next time I would open the case prop and secure the top. disconnect the battery connector ad attempt to remove to battery. If the tape removal fails then go back and remove the top case. Just remember to lay out the connector cover screws on the table in the same pattern you took them out. Otherwise your will never get them back into the correct holes.