DO NOT CHARGE A LIPO (NOT LIPRO) , (it's short for Lithium Polymer ) WITH A WALWART ! ARE YOU CRAZY ? Lipo batteries burst into flames when they are over charged and like the previous post said it is a TWO cell battery. That means that the maximum voltage it should be charged to is about 8V. Also , it should only be charged with a LIPO charger. Thousands of cars and houses have been burned down by people doing what you're talking about doing and then walking away and forgeting it's plugged in and eventually the battery gets so hot it explodes in a fireball. Unless you can plug it in outside on a cement patio away from anything flamable don't do it . Get a meter and measure the output voltage of the walwart.