Does anyone know if said optical mouse requires a battery? My mouse at the office died yesterday while I was sneaking in a few minutes visiting my favourite Disney friends! Definitely not related to the site, but it was being finicky all day and finally gave up in late afternoon. Had to resort to typing commands! I inherited the mouse with the computer--no manuals available. I'm taking my old Dell mouse in as a temporary measure--hope it works, as I can't find the driver. It's a Dell computer, so fingers crossed. I'd prefer not to pay OOP and be reimbursed later, but I it's necessary, I'll do it.