2011 iPhone 4s First-Time Battery Replacement

Il Mio Problema

The battery's lifespan has severely degraded after 7 years. The indicator gets stuck on 1% for a long time.

La Mia Riparazione

It went well with the exception of the removal of the 1.7 mm Phillips screw by the battery connector. The reason it took my battery replacement process 3 hours is that I stripped the aforementioned screw. The included iFixit screwdriver's Phillips screw attachment for reason didn't go well with the 1.7 mm screw. After I miraculously removed the stripped screw, everything else went without a hitch.

Il Mio Consiglio

Don't strip any screws. If you think you are careful during the unscrewing process, you should probably be a little bit more careful.