Needing help powering up a Sanyo ICC-801D

[AndiGer]

The power plug seems to be on top side. If I look at some pictures of the machine I guess it has a rechargeable battery inside. You can imagine if you look at the photos on this site
https://blog.goo.ne.jp/vrc-tezuka/e/9599...7652602867
where the plugs from the battery go to. (And yes you see where better don't touch due to high voltage for the nixies :-) )

On this photograph you can see the plugs but battery not included:
https://auction-antique.com/marketplace/...i_icc-801d

Good luck
Andi