This is a Brand New IBM Boxed Original Product.Stay unplugged longer with the help of a spare ThinkPad system battery. Help increase your productivity due to longer system run times. Get the power your need whenever and wherever you need it. Compatible IBM Models: ThinkPad 390: 390, 390E, 390X ThinkPad i1700: i1700, i1720, i1720, Replaces IBM part #s: 02K6513, 02K6520, 02K6521, 02K6534, 02K6535...