40y6797 Lenovo Hi Capacity 9 Cell Replacement Battery 41++ for R60/r60e/r61 15.4 Inch Wide Screen/15.4 Inch Standard Screen/r61i 15.4 Wide Screeen/15.4 Inch Standard Screen/r500/sl300/sl400/sl500/t60/t60p/t61 14.1 Inch Standard Screen/15.4 Inch Wide Screen/t500/w500/z60m/z61e/z61m. Does not work on T61 14.1 inch widescreen laptop/does not work on all Z60 or Z61 models 9-cell rechargeable battery Lithium ion technology 7800 mAh battery capacity 6 hour maximum battery run time; 4.3 hour max recharge time 10.8 V DC output voltage