After a full season of grinning my way around the woods on the Sur-Ron Ultra Bee, I did what a lot of us do when the snow starts piling up: parked it, plugged it in a couple times over the winter, and didn\u2019t think too hard about the battery. When spring finally rolled around and it was time for that first ride, the plan was simple\u2014turn the key, hit the throttle, and go find some dirt.<\/p>\n\n\n\n
Instead, I got\u2026 nothing.<\/p>\n\n\n\n
No dash lights, no whirring noises, no signs of life. The charger didn\u2019t help either. Instead of settling into a normal charging cycle, it just flashed that red\/green fault combo that usually means low voltage or some kind of unhappy battery situation. <\/p>\n\n\n\n
If you\u2019ve landed here because your Ultra Bee (or any similar high-voltage e-moto) is acting dead after sitting for a while, you\u2019re not alone. In this post, I\u2019ll walk through what happened with my bike, how I diagnosed the problem, and the process I used to slowly bring the battery back from an over-discharged state using a benchtop power supply and some patience.<\/p>\n\n\n\n