I have to admit having a trunk full of lithium makes you worry at times that your bms cuts off your charger as well as your load before its too late. I disconnected and removed my engine phev kit and its such a relief to not have to worry about anything going up in smoke or running out to unplug the charger when its done as a precaution.
In that respect, lead acid isnt all that bad.
I can rejuvinate any dead lead acid battery in 4-8 hours. If its too far gone I just return it for a pro rated refund or full replacement.
Try that with a123 cells.