I knew it was a smart phone 'Migrate'
My 31, was about 55 to 60%SOC, amp hour wise if it were still new, yet it was able to gobble 38 amps for those 17 minutes before the magic blue smoke release.
I have about 3 feet of 10awg to about 11 feet fo 2 awg to my 31. I've got some 8 awg on the way. but even when i put my clamp onmeter rght over the battery cable by the battery I was reading 36 amps when meters closer were reading that too.
The dropping to 20 amps in your phone dictation say your battery was much closer to 85%+ when you applied the megawatt, or the megawatt is Limiting current by 1/3, or your battery is not as healthy as you believe.
if it was at 60% when the MW was applied, the MW unless limiting itself it should have done 30+ amps for an hour or more,likely more. Have you another method to check your ammeter for accuracy?
I watched some U tube videos on the less expensive meters on Ebay and amazon, and even calibrated to the limits of the calibration pots, were way off still.
