AC Power from a Battery
The battery life is 12 hours, but I'm going on a four-day bike ride (camping overnight), so I need a way to charge it since I won't have access to AC power.
I've searched projects and gotten lots of hits on creating a USB charger from batteries, but I can't find anything on creating a power pack (with outlet) for charging my device.
Does anyone have any suggestions on what I could do/use? I'd hate to not be able to track my route after I'm done.