I only want to carry one electronic device, use it for navagation, web, phone....so I will be using my phone. Using it for daily use and rides I only get 5-6 hours when running navigation, I want to add a solar charger on the handlebar bag to keep it constantly chargerd. Has anyone done this? What charger, I see them anywhere from $10, to $300 for what looks like very similar items. Same USB outputs 1000 to 3000mAh. I would think 1500mAh should be more then sufficent, but want one that will last, and actually puts out the power speced.