Sepura rucksack

[Shuttleman]

Hi,
I bought a Sepura rucksack.
It does have a (dead) battery.
No power supply was with it, neither a charger.
Is there any documentation of these available?

I would need the pinout for the power supply and/or schematic for the integrated power control module.

Also, any insight on how it's supposed to work with either charger and/or power supply connected.