[Gary856]

If you only let it idle for 10 minutes, with the headlight and taillight on, I don’t think you’d charge the battery much. You may even be draining the battery with a low engine speed and the lights on. I don’t know what rpm you need to be at for max charging current – that depends on each bike’s charging system – but I’d guess it needs to be 3k rpm or above. Even then, not sure if 10 min per week is enough, especially when it’s cold, besides the fact that running the engine but not going anywhere is a pretty inefficient way to charge the battery.