[Leica] OT - battery behaviour in car vs camera?

[vick.ko at sympatico.ca (Vick Ko)]

So this afternoon, I'm in a hurry to go to the dentist, I get into my car
and find that the engine won't turn over.  Seems like I left the lights on
and drained the battery, after coming home 1 hour ago.

I use the wife's car, get my appointment over with, and then face the
challenge of having to boost my car.

Just anyway, I try the car engine, and miraculously, it turns over to start
again.  I idle it for 10 minutes to let it recharge (apologies to the
planet).

So - do car batteries "revive", even just enough to start the engine?  Never
saw that phenomena with camera batteries.  Once they are flat, they are dead
(camera batteries).

...Vick