This 6-cell rechargeable, removable Lithium Ion battery, maximizing 4000mAh power, gives you plenty of battery life for those long meetings and flights. It easily connects to the bottom of the notebook for quick change-outs while the contoured design raises the back of the PC to a comfortable typing angle, helping to reduce strain. Rubber feet prevent sliding so your notebook stays put on the desktop giving you a firm typing surface. Weighing less than one pound, it transports easily and doesn't weigh you down or take up extra space in your carrying case. Get the mobility you need to stay productive longer.