Why are Inland replacement laptop batteries better? CAPACITY - Inland batteries use the same capacity battery cells as your original battery or better! Other vendors cut corners with lower capacity cells. QUALITY - Inland batteries use cells manufactured exclusively by the trusted brands Samsung, LG, and Sanyo. Other vendors use unbranded cells manufactured in China. SAFETY - Inland batteries are manufactured with a USA-made, Texas Instruments control chip. You are safer using an Inland 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 - Inland batteries come with an unprecedented two-year warranty! We can offer this because our quality is far superior to the alternatives. Replacement laptop battery for Lenovo laptops & notebooks, models include various ThinkPad units. This 5200 mAh Lithium-Ion battery is rated at 10.8V*, yielding 56.2 Wh of power. That's 18% more capacity than competitors' 4400 mAh, 47.5 Wh batteries! The longevity rating is 1000 cycles and it comes with a 2 year warranty. Micro Center offers Lenovo laptop battery replacement and installation services to ensure your laptop will be back up and running quickly - ask the store for details. This is a replacement for Lenovo part numbers including 42T4791, 42T4791, 0A36303, 42T4756, 51J0499. See the specs tab for detailed Lenovo laptop compatibility. *Also compatible with 11.1V and 10.95V applications.