So, at first I have to apologise - I had the White-Balance set to manual at first 
The battery is hold in place with some tape and isn’t directly soldered to the pcb - it uses a plug (plug and jack were glued together, so I had to tip them both off)
2.5Ah instead of 2.6Ah? I want my germoney back! 
And that’s how this thing seals up - the big nut presses the conical part onto the O-Ring and therefore press it to the outer tube.
