water damage can do things to phones you cant even imagine!!!!
it possible it created a SHORT in the battery connecter causing it to get damaged.
i leave my phone all day on my USB charger and it doesn’t even get fully charged... ( i do play some games doh ) but AC charger gets it FULL battery even if im playing with in 2-3hours
Another way to see if your battery is damaged .. if the battery bubbles up a little.
next time u get watter ony our phone:
1.take battery out ASAP!!!!!!!<
2. get a hair dryer... when u feel your phone is about to MELT .. keep going an other 10min. ( it won’t melt
)
3.put it in a bag of rice for 3 dayz (this absorbs the humidity )
4. you can try to open your phone and clean the Electronics with RUBING ALCHOHOLE!! ONLY no other liquid..!!!! (I use a old toothbrush)
5. hope it works after all that.
all this will basically help to prevent corrosion , and in return damage to the phone.