So. My Glo replacement.
It had 50% charge out of the box. I plugged it in for a while messing around with adding files. Eventually it was around 65% (I can't remember). That lasted me 2.5 days.
My first full charge was completed (well, done overnight) yesterday morning. It spent most of yesterday on 100%.
This morning it was at 82%.
Now, after six hours in sleep mode... it's at 67%.