A:AnswerMine was charged when I bought it. It has a charging cord that plugs in to a regular outlet like your cell phone. A small red light indicates it is charging. When the light goes off you're set. Charge seems like it lasts forever.
A:AnswerI haven't been able to use mine long enough to find out. It actually looks like it would need to be purchased. I never had a problem with it running down during the time I was using it. My problem is that after using it for one week when I went to use it it wouldn't work for longer than 5 seconds. I thought perhaps it hadn't been plugged in correctly so I checked the cords and left it for the day. However several hours later it still wouldn't work. Battery is awful.
A:AnswerThis vacuum does charge pretty quickly, which I really like. And I have left it plugged in for quite awhile after it was charged and haven't had any problems. So, yes, you can leave it plugged in after it has been fully charged.