thanks, I have checked battery,
found 53 V and ....3 dead cells , I replaced those and now 61V but it didn’t starts the same as previously, charger when plugged
only ligts red for five minutes not more and then green that’s it.
shoud try to check the charger - good idea:) also when swiched off wheel is turning in steps like some coils are stopping it. is it normal? newer noticed that before.