We had such high hopes for this product after reading all the reviews. Turns out the "18 month" battery life that is advertised is 18 months until you have to replace the actual lithion ion battery. The battery, when fully charged, lasts only about 10 minutes total which makes this horribly useless when it comes to cleaning cars or stairs. It also seems that they expect you leave it on the charger at all times, I didn't want to have to leave this plugged in and out all the time. I was hoping for a unit that I could charge and put away, and then use when required to clean out the car or stairs. No such luck.