The dell power companion lets you bring extra power with you so you can be more productive this handy device powers select dell notebooks and ultrabooks as well as up to two smartphones tablets or other usb enabled devices it features 18 000 mah 6 cell battery that provides reliable power when youre on the go and is easily charged using your dell power adapter moreover it is lightweight and compact so you can stay powered on the go without adding bulk to your bag with all this features