The problem with the iGo is not electrical (the wattage rating is not important from an electrical point of view- it wont "overload" the battery, the voltage rating (12V) is all that really matters). The problem will be to find an iGo "Tip" that fits the eDGe. This was discussed some time ago, and no one ever wrote that they found a tip that fits the eDGe. I tried by buying a huge assortment of iGO tips, but none of them worked. If you find an iGo tip that works, please let us know!