Trying eBikes ! No Im not trying them. But ebikes are trying me !

[madmax21]

Hi there I love ebikes and would dearly like a super speedy (50mph bike but I cant afford the bits. Just built two latest bikes. Very standard. 36v 350w one front wheel one rear. One working fine the other causing me problems. Was great and then suddenly the dreaded 'one bar' on an almost fully charged battery. Took it out and it slowly lost power. Battery showing full lights ! Controller ?