at first I be a little disappointed in this ; it run out of charge about 15 minute after 21 hour of pre-charging as recommend by B&D; . however , after about 5 use it do seem to last longer -- about 20-22 minute for I . it be design to : 1 -rrb- be keep in a kitchen for flour , sugar , oatmeal , cereal , and other spill that can be easily pick up 2 -rrb- clean up spill cat litter that you spill ; litter that you cat kick out of the pan when do he thing ... 3 -rrb- sit next to tool bench or woodworking area where moderate mess be a sure thing 4 -rrb- pick up pet hair from the place you know you pet like to sleep\/lay in -- go there vacuum the place , return it to the charger . I would give it 5 star if it have be design to ALSO use a electrical cord like my weed-eater unit by B&D; -- then it would be the best of both world . BOTTOM LINE : everyone would like a small and lightweight vac that last for 1-2 hour per charge , that we can carry around the house to replace the armored-tank that we have to drag around ... THIS AI not it folk ... Works great for what it be design to do ; do not work great for what it be not design to do ...