I don't know how many cells are in your battery, but 12000 mAH sounds too high to me. I don't think I've ever heard of any laptop battery that delivers that much power. Are you sure you're looking at the correct type of cell for your machine? Does the place you are getting them from have a website so we can check it out? If your laptop spends most of it's time plugged in like most do, then recharge time shouldn't be an issue.