I used this two times!  Then the charger wouldn't charge any more and the other battery they give you just didn't work and there is no way to charge it.  Very disappointed because all the reviews say how good it is because it comes with two batteries but if they don't work what good is that? So this has been a waste of my hard earned money. I just wanted a quick way to clean the floor after dinner quess I will just stick to a broom.  You don't have to charge them and they always work.