That is super annoying, I recall you replacing a battery on one of them not so very long ago.
The charging thing has reminded me of PJ's car and it seems likely that he had current leakage on his possibly due to a loom fault. He has had repeated battery failures if I recall correctly.
Good luck with the starting and recommissioning.
The Aero's seem a little like marrying a super model, expensive to run with a few flaws- but WOW when they are up and running
