That's far, far, far too expensive.
Thwt aside, and obsolete battery doesn't prevent an insurmountable obstacle. It can probably be re-celled when it expires, or else the bike modified and a different unit fitted itmyoumhave the gumption.
But 700 sheets is about three times its real market value.
https://www.cyclechat.net/threads/which-ebike-should-i-buy.299823/
Which one would be the best choice in your opinion?