Why wont the battery keep its charge

Jump it and drive it to ur lo al autoparts and tbey can check the battery and ur changing system free of charge. Ur car might still be under warranty

I would chexk with ur dealer and if still under warranty, take it to the dealer instead

You either have a bad battery, a bad alternator or a parasitic draw that is discharging the battery. As suggested above, first check with dealership to see if it is under warranty. My guess is that it may be out of warranty due to being over 36,000 miles. Next step if out of warranty is to have the battery and charging system checked.

We have a new battery. I took it to the dealer and was told “there is a piece on the side of the battery that tells the battery when to charge, need to be replaced $300” I would like to know the name of the part. We bought the “total warranty package‘ When we bought the car, but they, of course, say this part is not covered.