2 of 2 people found the following review helpful
A great battery charger and USB power pack for phones,
This review is from: Goal Zero Guide 10 Plus W/ Batteries Battery Pack (Automotive)
I have two of these. They are designed to be used with the Goal Zero small solar panels and work really well. They can also be charged via a USB charger.
With the Nomad 7 solar panal, you can charge the batteries in a few hours 3-4, its very effective in sunshine.
You can then use the AA batteries as normal or use the powerpack as a USB charger for an iPhone or iPad mini/iPad2.
The USB socket outputs at 5V 1A. Gives you around a 65% charge for the iphone 4 and 25% for the iPad mini. Useful if you want to keep your devices topped up. Handy when your batteries become past there prime, as you can just replace them. Do not use normal AA batteries in this device (as a backup), as it raises the voltage at the USB socket.