i've clocked ~8 hours of media time with a T420s with an ultrabay battery and tlp/powertop reporting an average of 6-8w during the process. Regular battery + the extra ultrabay battery put the capacity up to about 7.7Ah; about the same range of battery capacity as a newish macbook pro.
a t420s is a very old core machine at this point. I would suspect the same conditions with a similar amount of battery with a modern processor could do a lot better; but i'm getting too old to sit in front of a screen for 8+ hours of media time, honestly -- and lately with USB-PD and power banks I have been skewing towards buying ultrabook style laptops and accessorizing via USB3 rather than with proprietary expansion slots.
I don't know what the media time on something like a laptop with an N100/linux + a powerbank, but I suspect it'd be quite a long time.
i've clocked ~8 hours of media time with a T420s with an ultrabay battery and tlp/powertop reporting an average of 6-8w during the process. Regular battery + the extra ultrabay battery put the capacity up to about 7.7Ah; about the same range of battery capacity as a newish macbook pro.
a t420s is a very old core machine at this point. I would suspect the same conditions with a similar amount of battery with a modern processor could do a lot better; but i'm getting too old to sit in front of a screen for 8+ hours of media time, honestly -- and lately with USB-PD and power banks I have been skewing towards buying ultrabook style laptops and accessorizing via USB3 rather than with proprietary expansion slots.
I don't know what the media time on something like a laptop with an N100/linux + a powerbank, but I suspect it'd be quite a long time.
typo: meant 7.7aH