There is a portable battery charger that I use in the field that I find irreplaceable. I think you should all get one.
It has built in lightning plug (For iPhone) and micro USB (For Blackberry or Droid)
It has a built in prongs to re-charge it in the wall. (Most battery back up you have to plug into a computer to recharge)
It can fill up your iPhone about 4 full charges.
It has a light to let you know if it’s full or empty.
You can charge multiple devices at once and use the device while it’s charging.
*** Make sure to buy the one with the built in wall prongs. Hub 6000 or Hub 9000
“Wow, this is great.” – Denise Martinez-Ramundo
“Thanks, this is so great in the field.” – Gwen Gowen
“Can I borrow your battery thingy?” – Jonathan Balthaser