A 12vdc rechargeable vehicle jump starter works perfectly and lasts a long time. The jumpstarter will have a 12 VDC power outlet on it, so all you need is the 12vdc power cord from Guru. The bonus is that you can use this jumpstarter for your car, lawnmower, motorcyle, etc in case your battery goes dead. Serves many purposes. Mine works great and I use it even when at home right beside a regular 110vac power plug. Good clean power.