I am 74 years old and for the last 9 I have ridden a Wisper 705 se city S 2011. It has been a brilliant bike and the 36 v 11Ah battery was no problem until the case blew and it died. 9 is that the right term???) I have searched and requested and got nowhere looking for a replacement battery. Can anyone help me with a way I could get it on the road again? I don't know how many more years I have riding but I miss it so much. Thanks any ideas received with interest. Janjj