DETAILS: As a leading manufacturer of portable computer power accessories, Battery Technology is dedicated to providing innovation, reliable and affordable battery technology to generate power and functionality for notebook computers, camcorders, portable peripherals and cellular phones.This product is designed for IBM ThinkPad T40, R50. Product Description BTI notebook battery - Li-Ion - 4400 mAh Device Type: Notebook battery Battery: Lithium ion 4400 mAh Batteries Qty: 1 Manufacturer Warranty: 1 year warranty ALTERNATE ITEM #: IB-T40L UPC: 0745473111524