Originally Posted by
pseudoswede
I think the fact that my laptop ran on its own battery for an hour, and the fan was blaring since it was running OBS and livestreaming at the same time (in my home office, so not cold weather*), and it only used half of its battery capacity means something was definitely wrong with a 20,000 mAh power bank that drained completely in 90 minutes. I only use the Balanced Performance power profile in any of my Windows laptops.
Something wrong sure, but don’t expect an exponential jump in battery life.
Your laptop on internal battery seems to have averaged ~19W (or less) for that full hour.
(Sorry, read it as only 30mins earlier.)
Baseus notes their 20,000mah battery currently on Amazon will charge a MBP 13” to 90%; that’s about 52Wh (assuming they meant the M1 MBP with 58Wh capacity, not the 2017 MBP with 49Wh).; that’s about a 70% efficiency from stated capacity to true output.
(Saw the cells are normally 3.7V nominal, 20k mAh would yield 74Whr.)
That 52Wh at your 19W average should give ~165mins with optimal conditions, so you might get 80% more runtime for this setup if the replacement you get is perfect. (But yes, the cold weather will affect that.)