HAnilsen wrote:
You should look for an independent repair store, preferably one that is specialised at repairing phones. They can change the battery for you. Make sure they use a good quality battery, because iPhones doesn't like bad quality batteries very well.
[Edited by Host]
I thought about suggesting that, but then thought maybe my comment wouldn’t last here. That’s a rather difficult thing to recommend, but it may be the only practical means for the OP.