This lot have offered to refurbish and recell my battery as it is getting low on range - they seem good
https://bga-reworking.co.uk/product-category/all-products/e-bike-batteries/
Legally it should cut out at 15.5 m.p.h. so if it previously at 18 then it was, theoretically, illegal. I suspect that either you have mis-remembered - or your previous speed measurements were inaccurate for some reason
Hi all
I got a secondhand year old Powacycle Salisbury about 7 years ago - and I have riding it round ever since - best £200 I ever spent
Looking forward to getting info etc from here