water damage months ago

Otto, the first thing I suggest is that you disassemble the phone using these guides. This means that you will have to totally disassemble it to the point of removing the logic board. Then clean the phone with +90% isopropyl alcohol. Use this guide to clean it. After you have everything properly cleaned, replace the battery There is no substitute for replacing the battery. Reassemble your phone and re-evaluate. If you do not clean your phone, you will get corrosion failure later on, or in your case, you may already have plenty of corrosion to deal with. Please do remember that Rice etc. is absolutely no substitute and will only make a bad situation worse. Hope this helps, good luck.