I have a 2018 Ecotric Leopard. I love this bike..! I took the battery out for the Winter,put it in a month ago after I charged it fully. When I went to go for a ride,I usually start out in PAS 5. That's full throttle use,no pedal. However,I had no throttle. Only pedal assist mode. The console shows fully charged,but it won't engage the throttle when turned. Could this be a battery problem..? The throttle assembly seems straightforward. Are there contacts that get dirty in these..?? Any input would be appreciated.