I get this reproducibly after about a minute. Boot finishes, sits at prompt for tens of seconds, then apparent voltage goes to zero and Pi shuts down.
VIN: 4.83 (plugged in)
nodeid:1,voltage:4.82
VIN: 4.83 (plugged in)
nodeid:1,voltage:4.83
VIN: 0.06 (running from battery!)
nodeid:1,voltage:0.06
MB is plugged in to wall power supply. Have tried multiple known good power supplies. When I bypass might boost with good power supply, Pi runs fine as expected.
Dead regulator? Using same sketch as I always use.
Colin
What exactly is VIN?
If you get more than the battery voltage on the MB output then the booster is OK.
What is the load attached to it other than your Pi?
This is your MB sketch with terminology modifications. VIN is the divider voltage used to determine when to shut down the Pi. Boost voltage seems fine by meter even when it shuts down, so I'll have to do a bit more poking.
C
I've seen where the battery will dip for a short amount of time or if it's fairly discharged it cannot keep up and it dips, then the calculated VIN will be below the threshold and issue a shutdown. You could add some buffering to that if you believe it's a false reading, but my guess is the battery might be the problem. If this is running plugged in then it should not happen as long as the supply is stable.