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@Greenbank
If Garmin did one with AA batteries and ANT+ (HRM, Cadence and Power) then I'd snap it up.
For Audaxing I need something to last 20+ hours (and up to 80 hours on some rides).
Right now I get by with my Edge 705 and external USB power packs (the Edge 705 is happy to run whilst being charged/powered) but it's a bit of a faff.