wisper 905 torque

Wisper 905 Torque, 6 years old and had a replacement battery last year. There's regular resistance when pedaling like it's losing power at any speed and on flat terrain. Seems to be getting more regular and it often feels like i'm pedaling in manual mode than with any assist. The controller LCD...

Hi can anyone assist me in what size rear axel etc i will need to convert the 905 torque to quick release, also i would like to change the adjustable stem what size is the steerer tube, i understand the rear wheel is bolted to avoid theft but i'm willing to take that chance for the ease of...