Aircraft and hot battery instances have been around for many years. The emergency procedure on a Falcon 20 is to disconnect the #1 battery before shut down if a generator fails to come online. This prevents the rapid charge/discharge from occuring at the same time. Before Concorde came out with the sealed lead acids, most if not all, corporate jets (regardless of manufacturer) had a battery temp monitoring system and an emergency procedure for a battery over temp. So its not a “new” issue for batteries or aircraft. My guess would be they have something going on with this same scenerio (rapid charge during rapid discharge) or the batteries are overloaded. New technolgy in aircraft always brings new challenges as they are much more electrically complicated than cars, boats, motorcycles etc.. I run the Smart Battery 100AH (4 of them) and have monitored the temps during trolling motor use and while charging and have yet to feel them get hot. Nothing scientific, just the old feel with the back of the hand.Sorry for the long answer but thought it needed some explaining.
.
