Water damage. Battery drains quickly and slow to charge. What to do?

Jennifer, besides all the things SIMRAN suggest, I would go about it this way. Disassemble your phone using this guide. Clean every parts with 90%+ isopropyl alcohol. Use this guide to see how to clean it. It was written for a 3G but all the steps apply to your phone as well. Once it is cleaned properly, replace the battery. A water damaged battery " it overheats. Mainly the battery is draining 1% every 2 minutes.", might be the reason for that. Once you have all that accomplished, reassemble and re-evaluate. this is not to say that it will fix it 100% but at least you have a definite starting point. There is of course still the possibility that your logic board has a damaged PMIC or various other SMD components. So make sure that you take a good look at all those when you disassemble your phone. Hope this helps, good luck.

I have similar problem with a samsung and changing the battery didn't help. So i'm trying to find out what it could be.

put a battry in high sunlight for 4 to 5 hours then ur battry work fine ,,,

Hi I had this problem with an iPhone 5 which got wet in the rain but seemed to continue to work however the battery was draining quickly and sometimes it was not charging or switching on. I opened it up and used a hair dryer on hot to dry the top and to bottom of the phone (not the battery as I heard this was bad for it). Left it for 10 minutes to cool then repeated the process - the case was very hot. Works like a charm now good luck