Chosen Solution
I’m replacing the battery from an iphone 6 with a new one from here and I’m also using the adhesive strips from here. I don’t know if anything else is wrong with it besides the battery. If there is, and I have to remove the strips again, would I be able to take them off and use the strips again?
The battery adhesive strips are for one-time use only. When you replace the battery, install the battery but without the strips, check everything to make sure it works and then install the battery strips and close the device.
There is no way to remove the strips without destroying them once you’ve installed them. As @refectio said, do a test run without the strips and then install when you’re ready for final assembly.