content: My Xantrex XPower Powerpack 600 Heavy Duty is not good for an emergency. It is an emergency. The unit does not hold a charge. It takes days to fully charge and loses its charge by 10% each day.Xantrex customer service has not been helpful other than to say that I should charge it through my car cigarette lighter.I ask, what should I do charge it all the time. Thats the only way their will be any power when you need it... I bought this item to help if I have a problem... It is the problem.