Something odd happened with this last experiment. After about 4 hours, the lapdock itself was down to about 53%, but the Librem 5 battery meter jumped from somewhere between 60 and 70% (I wasn’t really looking at it closely other than to notice it was quite a bit higher than the lapdock, I was mostly focused on the lapdock battery) down to 10%, then 5, 4, 3… within a minute, so I decided to end the experiment and plug the phone back in.
I don’t believe that there was suddenly a larger power draw that caused it to drain, and I’m asking the team for any suggestions as to the cause. My first guess is either something with this now pretty old battery in this Librem 5 (maybe a failing cell or something?), or something being off with power estimates. I don’t have full knowledge (at least yet, I will soon! 
) on all the factors that go into that calculation, but I imagine if the battery voltage is a major part of it and voltage dropped dramatically in this pretty old battery, it could cause that.