Lenovo Lithium Ion ThinkPad Battery 68 + ( Manufacturer P/N ; 0C52862 ) 6 Cell Extended Life System Battery, 72Wh, 10.8 v, 0.74 lbs.<br><br> Compatible With X240, X250, X260, X270, W550, W550s, P50s ( Not the P50) ,  L450, L460, L470, T440 ( Not the T440p), T440s, T450s, T450 ( Not The T450p), T460, T460p ( Not the T460s) , T470p ( Not the T470), T550 ( Not the T550s or T550p), T560 ( Not the T560s or T560p) . Lenovo Model Numbers Are Suffix Specific. Lenovo Battery 68+ Is Safeguarded With A Chip To Authenticate Itself With Lenovo Systems.<br><br> Lenovo Battery Reset May Be Needed If Your System Is Not Recognizing The Item. Remove And Re Install The Item To Fix This Issue. This Is Due To Recent Windows Updates. Lenovo Original Manufactures Factory Authenticity Sealed Retail Packaging.