Lenovo ThinkPad Battery 68 ( P/N:0C52861 ) 3 Cell , 23.5Wh, 11.4v, 0.4lbs, Check Compatibility Lenovo 0c52861 3 cell battery 68 - Battery capacity (Amp-hour): 2.06 Ah , Battery energy (Watt-hours): 23.5Wh,Output voltage: 11.4 V dc (nominal). Compatible With X240, X250, X260, X270, W550, W550s, P50s, L450, L460, L470, T440, T440s, T450s, T450, T460, T460p, T470p, T550, T560. All Lenovo ThinkPad Models Are Suffix Specific. Lenovo Lithium Ion Battery 68 Has Over Discharge Protection. Lenovo Battery 68 Is Safeguarded With A Chip To Authenticate Itself With Lenovo Systems. 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.