So I've done some measurements, it seems that the battery is quite dead (all measurements were done with frontlight set to 3)
Grey zones are times where PW entered 'suspended' state.
Similar green zones for charging.
It lasted a little more than a day on a single charge.
I've replaced the battery situation improved instantly, so it'll take some time before I discharge it fully and attach a new plot
Dirty python script to generate plot from battery.log attached (python2+matplotlib)