Hi - I have a Merida E160 e-bike with a Shimano DU-E8000 motor that has done 13000km (90% on-road) and is getting a bit noisy. I am thinking of either replacing the motor, or buying a new bike. One complicating factor is that I have 2 batteries, which I would want to be compatible with a new motor, should I choose to go in that direction. Any recommendations?