Following 1.11 release it is now a requirement to be able to recharge car and truck batteries as they drain when starting the engine. I have been able to charge car batteries to approximately 15-20% charge on most attempts from completely empty (draining with use of a construction light and metal wire). I did manage to charge a car battery to 100% on one occasion however I am unable to replicate this.

Regarding truck batteries I have tried assembling the generator + battery charger + truck battery in all orders and states at time of connection, to no avail (attempted using 2 different generators, 4 different battery chargers, and 2 different truck batteries at both partial charge and full depletion). Nothing has granted any charge to a truck battery and it saddens me knowing that soon enough my two remaining batteries will deplete, and if I do not find more then my beloved M3S will be destined for the scrap heap.