Chosen Solution
I replaced a battery to a “supposed” new battery for an iPhone 6 and it resulted in a different issue. Now it takes about 30 minutes to turn on while it’s charging and then it takes like 30 minutes to charge up to like 17% and jumps all the way too 100%, then i take it off the charger and the battery lasts like 10 minutes and dies at 80%.
My recommendation would be to reinstall your old battery and see if the issue persists, as it sounds like you just got a bad one. I also recommend ordering the battery from iFixit if you haven’t. You may also have a charge port issue, but I wouldn’t worry about that until you’ve tested another battery out to make sure.
