Does this hold a charge or do I have to...
Does this hold a charge or do I have to have my phone/gps/etc. plugged in while it's charging? Just wondering if I can charge it at home before leaving on trip or if I have to plug in my phone and strap it to my pack while hiking.
You need a separate unit to hold a charge, Josh.
You can either but the panel by itself, our you can purchase the Guide 10 with includes the Nomad 7 and the battery pack that Steve mentioned.