Talk about 11th hour

I’m doing a 400km tomorrow, my garmin will be good for 14 hours, but I need 20/22 hours.
I’ve got two Duracell Travel packs that are 5V 1000ma. Have I seriously under estimated how much extra hours these will provide?

Over 10 hours I take my power monkey and a USB cable for garmin 800. It’s heavy but gives about 5 days of power and more if I use the solar panel 🙂

Depends on your garmin 650 series can do 22 hours on one charge and one set AA should be good for another 10

It’s a very basic Edge 200. 1000ma about 10 hours? That’s what I was hoping.