The ThinkPad Battery 57+ (6 cell) (0C52863) features:<br>
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Lithium-ion technology <br>
6 cell system battery <br>
Over-discharge protection to prolong the life of the battery <br>
Battery energy (Watt-hours): 57Wh <br>
Battery Safeguard chip authenticates with Lenovo systems <br>
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View Compatible Machine Types :<br>
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ThinkPad<br>
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L Series<br>
<br>
L540<br>
20AU<br>
20AV<br>
<br>
L440<br>
20AS<br>
20AT<br>
<br>
T Series<br>
<br>
T540p<br>
20BE<br>
20BF<br>
<br>
T440p<br>
20AN<br>
20AW<br>
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W Series<br>
W540<br>
20BG<br>
20BH