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IIRC the garmin battery is about 1000 mAh, so get an Anker battery bank based on that. The smallest are approx 3500 mAh.
https://www.amazon.co.uk/Chargers-Anker-Accessories/s?ie=UTF8&page=1&rh=n%3A340327031%2Cp_4%3AAnker -
I like the Garmin batteries, they strap to bars nicely, but are expensive and there's higher capacity options now in the form of Anker and Zendure.
freezing77
hippy
@c*j*f
Does anyone have any suggestions for a good external power source that can fit into a top tube bag to power a Garmin for longer rides? The Garmin battery lasts for about 10 hours and won't last for a 200km+ ride.