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Of course, bike-to-bike requires...a second bike. Another alternative for the solo rider is a small, WeeGo 22S lithium-ion Jump Starter. It's not much bigger than a cell phone...Steven Rossi
I also carry one of the lithium powered portable power packs. Never needed it myself, but I've successfully jump started a couple of others who needed the help. Its rated at 2200 Amps (peak) and is also capable of jumping through the battery tender pigtail. Also doubles as a cell phone or action cam charger, fire starter or flashlight for emergency use.