power consumption

[mpj111]

I have a theriotical and practical problem.
My lap top is 18V. I amusing 10V 4000mAH battery.
how long I can use my lap top if battery is fully charged.
how to calculate how much current drain from battery. how much current drain if I used 18 V , 4000mah battery

thank you

 

[Eggster71]

Get your multimeter on DC current and see what the draw of the laptop is? Surely it's going to vary depending on how much you do

 

[mpj111]

I am sorry, I have forwarded my question to the wrong forum.
I found the right forum and got the answer already.
sorry for your inconvenience

 

[Guest123]

Sorry for the un-helpful replies you recieved with regard to your querey.

Regards.

 

[Christech]

Just out of interest what was your reply ?. as i can't see a true time/usage being able to be given.

 

[Guest123]

I would have thought it depends on what you are doing on the laptop i.e playing music, watching a film surfing the net etc etc.

Depending on the current usage of the hardware/software could be anything from 1 - 3 hours.

The 18V laptop on a 10V battery doesn't quite sound right either.???

 

[judemartins]

from my personal experience on power consumption, almost all laptops batery uses between 17.5v to 19v, so users have to take note of that.

 

[pushrod]

would have thought something along the lines of


time = energy of battery
ave current x voltage