Which ebike should I buy?

[Attis07]

https://m.facebook.com/marketplace/item/1190668405450203/

https://m.facebook.com/marketplace/item/995809092548998/

https://en-gb.facebook.com/

The city I live at is quite hilly has hilly areas.

 

[Attis07]

https://m.facebook.com/marketplace/item/1172927133765982/

I have tried out the bike in person but the only issue is that battery (Unlimited) is not produced anymore at all, so if anything happens with it then I could not replace it. The seller told me that it is not produced anymore.
Apart from this the bike itself is in brand new condition. Never been used.

He would sell it for 580£ to me, we shaked hands and promised it to me as well. He realized (during my visit) that it has a power assist function when you start up the bike and that is why it is 700 quids now but the time when I have checked the bike in person it was 580£. He told me the bike would actually worth 1200£.