Tell me more about this Garmin battery pack - how does it differ from a standard li-ion battery?
13hr might not give me enough time...
It only differs in it's a torpedo shape with strap to fit bars, rather than a box like most battery packs. It's just enough for 24hr with no navigation. You can normally use any external pack so long as the pins don't make it go to USB mode.
@hippy started
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Tell me more about this Garmin battery pack - how does it differ from a standard li-ion battery?
13hr might not give me enough time...