Ok, at the end of the repair, I tried to use the new pentalobe screws that came with ifixit replacement battery but they did not seem to fit. So, reverted to the original pentalobe screws for the final step to close up the phone. Beside that, everything went smooth. I also skipped the steps about detaching the frontpanel (seems not necessary if only replacing the battery)
Ok, at the end of the repair, I tried to use the new pentalobe screws that came with ifixit replacement battery but they did not seem to fit. So, reverted to the original pentalobe screws for the final step to close up the phone. Beside that, everything went smooth. I also skipped the steps about detaching the frontpanel (seems not necessary if only replacing the battery)