It is possible that some hardware of charger got damaged. Do you have acces to diagnostics?

Did he charged it periodically? If no, there is huge chance that we will have to rework this battery.

Please contact me directly via e-mail.

just look above front wheel where front fork  goes, 
charger should be gold/or silver.

What is production year of VX1?

inside, most probably you have nickel batteries. If scooter was standing and not charged for two years battery voltage may drop to the point that you won't be able to charge it by on-board charger.
Only way to check battery condition is to open bike and measure/ charge battery using external charger.

Please contact with me.

krzysztofluby@vectrixeurope.eu

Please contact me for more information.

krzysztofluby@vectrixeurope.eu

Please send me PM about can interface you were talking about. I literally have no sign of your email.

krzysztofluby@vectrixeurope.eu

System may not recognize temperature of this cell so don't drive with dead cell inside.

To use scooter dismount/or bypass broken cell. There is risk it will burn.

in VX-1 you won't be able to do it without disassembly of the head panel.

in VX-2 you are able to do it.

Could you add picture of black panel near to the knees?

To adjust headlight you can open this panel (only if it's possible, there were two types of panels, solid and with "opening door")

To lower headlight turn marked screw counter-clockwise, to rise- clockwise.

VX-1 has the same mechanism but you need to dismount headlight.

Yes, you can. 

I'm waiting for results.