hen
rThe battery is 12V give or take 5 volts maybe and can probably sink just about as much as it can source
my point was that on a an old car with noting but charging, ignition, headlights and a radio you might go from a high load to almost no load
in a modern car that uses 10's of amps as soon as you turn the key, there's always a miminum load of a maybe few hundred milliohm so it would take a huge amount of energy to get hundreds of volts for a second
maybe it happens, I'm just thinking that the spec might have made when cars were different
-Lasse