power of a laptop charger over time

[jpfa1406]

I need to know if the voltage or current of a laptop changes acording to the percentage of batery charged, what I mean, if the power(watts) varies in time.

Why:

I`m modeling the temperature of a laptot charger in time:

thats the function dT/dt = 1/(m*c)*(p-(T-Ta)/(d/(k*Acond)) + (1/(h*Aconv))) where T is the temperature, c is the heat capcity of the system, p is power.

[Electronics Wizardy]

What type of battery?

 

Do you mean the voltage of the wall charger, or the battery charger inside the laptop?

 

The wall charger is a constant voltage, only current changes, and doesn't connect directly to the battery.

 

The li-ion charger in the battery is a normally battery charger, depends on the exact battery type, but for li-ion battery normally your constant current for the begging, then constant voltage at the end until its full.