I seem to have developed a bit of a fetish for batteries.
Any one that knows me or reads this blog knows that I love my gadgets. I have specifically designed all of my kit to either be charged by solar (the Goal Zero Guide 7) or via USB.
On an every day basis I use the Plox Box. Which replaced one of the 2 Guide 10 Plus battery pack. It was only replaced because I needed more power for my iPhone 5 and USB Wi-Fi. I still used the Guide 10 Plus packs as a solar regulator when items cannot take a direct solar charge due to irregular power delivery