Looked good but overnight the drain suddenly started again. Without busybox-power installed. Now wondering what is causing this suddenly but I'll take my grief elsewhere...

EDIT: culprit found (and I hang my head in shame!): on the TV-out widget, tv out had been switched to on (by accident, user error). Now all is well again, lesson learned and price paid (new battery ordered and on its way to me because I started to blame everything in blind panic).