May I suggest measuring the actual battery voltage with a reasonable multi meter or similar, as judging charge level from LEDs on the battery or charger, can often be very misleading and inaccurate.Has anyone got any experience of a Stork Radion bike. We have a non runner and although the battery appears to be holding charge there I'd little power at the rear wheel, I can't see any sensor with magnets to trigger the power hen peddling