In uk.rec.cars.maintenance "Dave Plowman (News)" wrote:
In article .com,
wrote:
Dave Plowman (News) wrote:
In article . com,
wrote:
By "on the road" do you actually mean driving? If parked then just be
careful your battery can withstand being discharged repeatedly.

What do you reckon the capacity of the laptop's internal battery is?

Why is that relevant?

Because it's likely to be be tiny compared to the car battery.

Smaller, but not tiny.
Many laptop batteries are 10% of the capacity energy-wise of the car
battery.
7Ah@12V or so (9 Li-ion cells, for example).