Can I use this to determine battery capacity? RRS feed

  • Question

  • Can I use this program to estimate battery capacity?

    My laptop was calibrated using the laptop setting (no WattsUp). Does 'base' include the integrated GPU consumption? If I sum all the power values recorded, is that the total power being used by my machine?

    I could leave the program running while the laptop idles on battery power until the automatic shutdown commences when the battery reaches critical voltage. I figure I can use the CSV log to calculate the area under the curve.

    I have an external battery pack which I want to test. It's rated at 20 000 mAh and I expect an operational duration of about 13 hours. Does the JouleMeter log too frequently for this? For one record per second I'd expect approx 47 000 rows.

    Thursday, May 23, 2013 3:51 PM

All replies

  • Well, I did my first experiment to check the capacity of the OEM laptop battery. It's rated at 48 Wh and my calculations using this software turned out 50.3 Wh. It's worth noting that the battery/laptop are four years old though (although for the most part it is run on the mains supply and doesn't use the battery).

    During the experiment, the total power consumption averaged at 22.3 W (standard deviation 0.4 W). I'll repeat the experiment and do it again with the external battery attached.

    Wednesday, May 29, 2013 2:09 PM
  • GPU is not included.

    While Joulemeter does not compute the battery capacity. Calculations such as integrating over power usage can give a rough estimate. But there is no reason to believe this estimate is more accurate than the capacity printed on the battery pack itself.

    Tuesday, January 28, 2014 9:27 PM