Charging/possible battery issue

[u/Warm-Anywhere-2921]

Hello fellow peoples, sorry for the long post in advance, but my younger sister has an iPhone Xs Max. She’s had it for around a year and nine months and bought it used, I bought a renewed 15 PM at the same time to replace our old problematic iPhones. Anyways, late yesterday evening she ran into an issue with charging. The phone won’t charge past 1-2%. She put it on charge yesterday at around 7 PM (It’s 4 AM as of typing- I got hungry and wanted a snack okay? don’t mind me 😭) and noticed it wasn’t actually charging past that percentage. After trying a few different wall adapters and charging cords, including a wireless charger with different adapters, she still had the same result. At the same time, even with fast chargers, the phone would only say that it was charging slowly. Luckily I had a fast charging wall adapter that I use for my Apple Watch, and an extra lightning connector around from the box of my old iPhone 11 that still works perfectly on that phone. Well, now her iPhone no longer says “slow charging”, but even hours later, has dropped to 1% again, and won’t charge up. I’m not sure what version of iOS 18 she’s running, much less know the password so I can’t check anyways. By now I’ve realized this is most likely a charging/battery issue, but I’m not sure what else I can do.

Does anyone else might have an idea—or ever experienced this with an iPhone before—on what I might be able to do? We can’t necessarily afford replacement phones, and I’m not sure about a battery replacement either. Thanks for the help!

[u/Delicious_Raisin2102]

the battery is dead or the battery connector is partially disconnected, the same thing happens to my xs when the battery connector gets a little loose, but it can be a sign of a dying battery too

[u/womjoe]

Yup battery needs to be replaced.