Microsoft Corp. today announced a new technology aimed at improving the battery installation process called InstaLoad battery installation technology, which allows users to easily install a battery without regard to positive and negative polarity. Never again will people have to squint to see battery installation diagrams — the device simply works regardless if the battery is installed positive-side-up or positive-side-down.
Link – http://www.microsoft.com/Presspass/press/2010/jul10/07-01InstaLoadPR.mspx