Hi all, I have posted on this subject above, but just to add, the battery problem, in my situation, is pretty much exclusively because I don't drive my car regulalrly enough. If your vehicle is your "daily driver" and cover a reasonable daily journey, say 30 - 40 miles, the chances are that you won't experience battery issues. Mine started (Previous Car 2021 NX 300h) during the colder months and I was almost daily getting warning messages on the Lexus link app telling me to keep an eye on my battery and that battery level was now critical. I was unaware that the 12volt battery was discharging due to lack of use, this almost leading to a totally dead battery over the Christmas period - even less driving. The above posts explain how the charging works, no alternator etc... After much searching I found a solution, which was to add a direct connection to the 12v Battery which in turn would connect to a trickle charger when the car was parked up. The messages soon stopped and all was well. I now have the NX450h+ and have added the same connections to my 12 volt battery and leave the trickle charger on when the car is not in use- so far so good and don't expect to get any battery notifications - now using the Lexus link + app. I still carry my jump starter (belt and braces). As I've said before this is not a problem exclusive to Lexus and is common with PHEV and EV's. Personally I think that this important information should be made clear before purchasing either by the dealer or Manufacturer and offer a trickle charger kit (fitted) as an option, or better still charge the 12 volt battery alongside the main batteries when plugged in! An interesting topic nonetheless.