I purchased a Suntour (Carrera) espec e-bike replacement battery after the original battery and display assembly were stolen. It took me about a year to finally get a replacement (new) Suntour display and holder. Trouble is, when I now connected everything, there does not seem to be power coming to the display. I am not sure why. The battery appears to be fully charged (displays 4 solid bars - but the blue lights also don't stay on (they disappears after a few seconds). Does anyone know how to diagnose the possible issues. I am not sure where to start, and don't have a tone of experience with e-bikes