If the Garmin gets 10h out of the internal 1100mAh battery, plugging it into the 3200mAh Nokia DC-19 should extend the total run time to ~36h. Is that enough? It's a cheap, ready made solution that could easily be hidden on a bike (unfortunately, fractionally too big to drop down the steerer) Nokia DC-19 Universal Emergency USB Charger - White: Amazon.co.uk: Electronics
I was hoping to get a few days out of it. Are there any larger but similarly conveniently sized options?
@hippy
I was hoping to get a few days out of it. Are there any larger but similarly conveniently sized options?