The Magtag that came with AdaBox017 always runs the battery down after 1-1/2 days. I had purchased two Magtags just before I received AdaBox017 and they have been working fine.
The AdaBox017 Magtag is currently running UF2 6.1.0-rc.0. I swapped batteries with one of the other two Magtags and copied all of the libraries and code so they would be the same.
But the AdaBox017 Magtag still runs the battery down after 1-1/2 days. The other two Magtags have been running days on their battery.
I don't know what else to check or try. It seems to operate fine other than can't run off battery very long.