I'm surprised that the light won't charge while it's being used. I have the Edge 1030 bike computer and I bike tour all over the world and as I'm in the saddle sometimes for 8-10 hrs riding, I connect a USB cable to a USB small charger in my top tube bag and charge the device while using it. Never had a problem. I'm going to call Garmin to find out as I want to buy one but 1.5 hrs on high is not very good (but then I just saw the NightRider LUmina 1100 OLED is only good for a little over on an hour on high as well and it won't charge on the fly either).
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