Data Point:
At 5% battery and Boost Off, it would fire at 18.2W, 4.7V into a 1.2Ω load and 4.8V into a 1.3Ω load... but not higher. IQ 95 FWIW
I was wondering if it could still hit 20 watts if almost dead. The answer is no.
But on the other hand, cranking it up to these high watts didn't...