Why are BTI replacement laptop batteries better? CAPACITY - BTI batteries use the same capacity battery cells as your original battery or better! Other vendors cut corners with lower capacity cells. QUALITY - BTI batteries use cells manufactured exclusively by the trusted brands Samsung, LG, and Sanyo. Other vendors use unbranded cells manufactured in China. SAFETY - BTI batteries are manufactured with a USA-made, Texas Instruments control chip. You are safer using an BTI replacement battery than one made with a control chip from an unknown source. LONGEVITY - The name-brand cells will last for double the length or better than knock-offs, exceeding 1000 charge cycles (compare to less than 500). WARRANTY - BTI batteries come with an unprecedented two-year warranty! We can offer this because our quality is far superior to the alternatives. This is a replacement laptop battery for Lenovo laptops & notebooks, models include various ThinkPad units. This 8400 mAh Lithium-Ion battery is rated at 10.8V*, yielding 90.7 Wh of power. That's 27% more capacity than competitors' 6600 mAh, 71.2 Wh batteries! This is a replacement for Lenovo part numbers including 45N1007, 45N1006, 45N1001, 45N1010. See the specs tab for detailed Lenovo laptop compatibility. The longevity rating is 1000 cycles and it comes with a 2 year warranty. Micro Center offers laptop battery replacement and installation services to ensure your laptop will be back up and running quickly ask the store for details. *Also compatible with 11.1V and 10.95V applications.