10-4 on the water check.
Now a note from a Factory Authorized Warranty Center - STOP working on it! Call them and have the problem repaired. Not that you can't do it, but just in case you do something else while you're checking it, you may cause additional damage or problems to void the free repairs. I cannot tell you how many times the owner causes more harm than good - even with the best of intentions
You probably have a bad cell in a battery, or a charger issue. First check that I would suggest is the owner maintenance items like water in batteries and the battery cable tightening. Beyond that - leave it to your dealership