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Title: You MUST have a "backup"!!!
Review: I bought this item along with a Coleman Queen Mattress. 30 mi N of Durango and a long, long way from civilization, I found this thing didn't hold a charge after 12 hrs of charging. After trying to blow the mattress up by mouth for 30 min and almost passing out, I abondoned the idea, having to sleep on the ground! DON'T RELY ON THIS ITEM TO HOLD A CHARGE for very long! I have since purchased a Coleman "double action" hand pump - no batteries/ no electricity!
