Excellent instructions. However the strips ripped immediately on me and I was being super super careful. I found that heating the back with a hair dryer allowed me to remove the battery using a credit card relatively easily.
The strips to replace the battery, YOU MUST make sure the battery cable barely has any slack or it will bunch up and not close the iphone properly. I wound up having to sacrifice basically an adhesive strip and a half. No big deal. Phone is 4 years old and will be replaced shortly anyway.
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