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jakemcree
For rides up to 600km, anything will do, you're just topping up devices that have been charged for the start. I've used 4xAAs in a box, Anker 5 mAh, Teknet 3.4 mAh. Main thing to check is charging compatibility with your device, especially charging a Garmin while it is in use. I've come unstuck with that once or twice.