It stays in the 12’s most of the time running unless you are off the throttle, the charging number I gave is when it is charging when coasting. I don’t know how it monitors the temp of the battery. It sounds like you are saying the battery temp is what determines the charging levels. The info Jeep gave the techs says something different. We will see, I am just gonna drive it and seeNow I'm confused. In your original post, I thought you said it went to 12.6 while driving. It's normal for it to go between mid 13s to mid 14s. That part is all determined by temp of the battery. If it was going into the 12s while stopped and ESS was activated, that's also normal. If it goes I to the 12s while the engine is running, that is the only issue. If its not doing that, you are fine.