Yes, there is a big warning in the manual saying don’t replace the battery with a normal battery must be a special one with lots of juice.
The manual advises you to knock it out of gear (hence allowing the engine to switch off) if you suspect you will be stationary for more than 5 seconds.
Starts in 0.3 seconds from dipping the clutch. It’s also quite clever (have it on two Fords) in that if you knock it out of gear in a queue on a hill say, engine goes off. Take handbrake off and let the car roll and once speed gets above 5mph(ish) the engine starts (so you have power steering or brakes). Similarly if you brake it starts. It also doesn’t turn off if you have climate control on and cabin temp is not at the desired temp. Also doesn’t do it until the engine is warm.