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The 1030, 830 and 530 can, I believe, all use the Garmin external battery which is quite a neat solution. The 1030+external battery combo gives you 40 hours run time.
I've also used a Wahoo Elemnt with a standard Anker power pack in a bar bag, and that worked fine too.
If you need an non-Garmin external power pack for extra capacity, I'd go for Zendure rather than Anker if you're using a dynamo hub, as Anker power packs don't have charge through.
Brommers-
I've run 800, 810, 1000, 1030 off external power. I don't think there's many that can't be made to run off an external battery.
I think Anker use better cells and my Zendure doesn't seem to do charge through when hooked to dynamo anyway. I prefer not to leave the Garmin plugged into external power all the time - that's why so many people have buggered USB ports on their units. I run mine down to 10-20% and then plug it in to charge full, unplug, repeat.
hippy
Going on my first solo bike packing trip for a week soon to do a couple of sections of the new Great North Trail.
I have zero sense of direction. What Garmin/external battery should I be looking at?