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onyerbike
You might want to check that all cables are in good nick. In my case the stem junction box => bottom bracket junction box had developed an intermittent fault (presumably due to bar bag rubbing & kinking it) and it wasn’t enough to kill the system altogether at first, but enough to make it appear as it was draining super fast (to this day I’m unsure whether it was that, or the charger not getting through, but I replaced that one cable and the problem went away)