I've accidentally ruined my phone battery life, is there any way I can fix it?

I took a trip away from home to stay with my other parent, and thanks to a big mix up here and there on different days with the phone chargers, I switched around my phone charger and charger brands too much and now my phone dies really quickly and takes forever to charge. Is there any way I can fix this?

I have an iphone 7 if that helps anything.

Using different chargers makes no difference.

Are you currently using the correct charger? Be sure you are using the correct charger for your phone and it is working properly. One of the things that bug me about iphones and apple products in general is that they are *very* picky as to what accessories are used with them.