How long will a laptop run...

…on a car battery? We’re having an ice storm here in the Raleigh-Durham area and the power is out for who knows how long, so I hooked my laptop up to a fully charged car battery (through an inverter). Laptop is a Toshiba 420 CDS and the battery is a 875 amp Everstart. How long can I keep the computer going? :confused:

If you’re hooked up to the car battery, presumably until you run out of gas. Unless the battery is no longer in the car. If that’s the case, no idea.

Good luck with the storm. :slight_smile:

I got the impression that this is a battery that is not still in the car. :slight_smile:

I would think the answer would be calculable along these lines:

Hours of usage = draw of laptop in watts per hour divided by total usable wattage of battery.

I do not have numbers for those variables, sorry.

WAG quotient of this post: 50%

wag 24 - 48 hrs

based on the weight ratio’s of a car batt and a laptop batt and the apx energy (power?) density of Pb- Acid and Nimh batts.