My 2018 Sahara, had both batteries replaced about a year ago. It spent eleven straight weeks in the shop after the 8 speed auto trans ate itself. While at the dealer both batteries died and they replaced them, but the new ESS battery would not charge so the dealer spent much time and effort to resolve this, including a new wiring harness and other bits. Now, less than a year later the ESS battery won’t charge.... not too surprising. What is the downside/negative effects of not fixing it?