Genuine IBM Lenovo Battery 42T4621 42T4572 42T4504Lithium-Ion, 10.8 Volts, 5200 mAh, 6 cell Compatible Models:IBM Lenovo ThinkCentre A61E IBM Lenovo Thinkpad R500 IBM Lenovo Thinkpad R60IBM Lenovo Thinkpad R60e IBM Lenovo Thinkpad R61 R61E R61I Series IBM Lenovo Thinkpad SL300IBM Lenovo Thinkpad SL400 IBM Lenovo Thinkpad SL500 IBM Lenovo Thinkpad T500IBM Lenovo Thinkpad T60 T60p IBM Lenovo Thinkpad T61 IBM Lenovo Thinkpad T61 T61pIBM Lenovo Thinkpad W500 IBM Lenovo Thinkpad Z60m IBM Lenovo Thinkpad Z61eIBM Lenovo Thinkpad Z61m