>>106956703
I do it for free.
Picrel, using freshly charged NiMH batteries on the f**o'd BTR11 still showed 80% after 5 hours. It showed 40% last time since the batteries were left in the drawer for years.
The original pillowed Li-ion was only 100mAh so I hope that would last at least 3 times longer.

>>106939963
Alright some tanch stuff
Unfucked the f**o'd bt dongle (bloated battery) by soldering a triple AAA battery holder in it. It works despite different battery chemistry, I guess it doesn't really mind a small voltage difference, although the battery sensor displays 40%.