The real problem with cell phones is how to manage the full discharge without losing phone service during important hours. I attempted to use every app I could to drain it at night, and it still didn’t drain. Therefore I effectively had very limited use of the phone the following day.

Looks like the best way to go about is to install the battery in the evening, charge it overnight full plus, then manage use the next day to drain it late at night, then charge it full again. The problem being changing the battery with a phone like mine on which the back cover and battery (why?) are heavily glued in place is a major undertaking, for which one might not have the endurance late at night.

Nice work, good guide. A few more notes:

1) If using a a case, check to see if the back cover is cracked before ordering the battery. If so, it may be necessary to order a new back cover.

2) It doesn’t require all that much heat to get the cover off. I used a paring knife to start it, rather than the flimsy pick .

3) Taking off the speaker assembly is not strictly necessary to get the battery out, but I did so as not to risk damage to its board and enable prying out the battery with less difficulty. Then I did not glue the battery in at all when putting it back.

4) Take care to reconnect the battery, and temporarily power it up before putting the rest back together. The connector is tiny, and not easy to seat.

5) If you use protective case and want the adhesive to come off easier if you ever have to replace the battery again, wear gloves, tack around the adhesive strip with the gloves to make it a bit less sticky before putting the new adhesive on, and don’t use any heat during the reinstall.