Hi. I have had this folding bike from new . It developed a fault. Loosing power after a mile or two, also going up an incline. I asked a question on here, with the age of the battery could that be the problem. The battery was a 9amp one, I have had it rebuilt to a 14amp spec. I have yet to get it from the Ebike folks. But someone suggests it could be a controller problem as well. I don’t mind having the battery rebuilt , seven years use is great I think. Would you upgrade to a 16 amp from 14amp controller. When the power went, if I stopped and switched the battery on and off, it always returned.Can You advise.