Vitaly

I find YouTube very useful for finding how to repair mechanical, plumbing items, so if there isn't anything in the page sited above, you could ask Geert Dijstelbloem in the comments about your particular problem with your bike. I had to add this separately because it seems there's a max. of 420 words per message.

I think there was something similar to the problem you describe on the YouTube channel made by Geert Dijstelbloem (about removing the battery on a Sparta bicycle which I believe is the same battery as on the Batavus Padova)
I think it was somewhere in the comments and in the reply that Geert Dijstelbloem made.