Charge it 4 to 8 hours before using it the first time. Charge it after every use, and empty the cup as needed. You will have to order a new filter off Amazon or Ebay after 6 months or so, as you can't wash the filter.
This picks up coffee grounds and pet food in the kitchen, spilled sugar, and powdered detergent in the laundry. I like it and it is very handy.
When I had my house built I had them put a outlet in my pantry for rechargebable items, such as this Swiffer. I aslo use Heavy Duty Swiffer pads so I can go longer in between changes.