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c*j*f
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