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It's only flakey coz people leave their external power plugged in all the time. I reckon that's not good for batteries either but that's just me thinking about laptops that are always plugged in and how their batteries seem to die sooner. Looking neater lol and I've gotta carry the cables for other stuff anyway. It's probably the best solution if you're right in the timeframe where that power lasts but if you need to charge it anyway I'd just use standard powerbanks.
hippy-
It's only flakey coz people leave their external power plugged in all the time.
I would beg to differ. I have 3 Garmins with flakey/totally non-operational USB ports, and none have been used with an external power pack. I'm sure charging them in the rain will hasten the progress but they can and do get corroded to the point of fuckedness in 'normal' use.
Brommers
Yeah, it's a poor proposition in terms of VFM. However, it does have the benefit that you rarely if ever have to use the notoriously flakey USB port for anything. And it does look neater and reduce cableage when compared to a third party power pack.