Specification: Battery type:Li-ion Voltage:11.4V Capacity:42Wh(Short Size)-NOT FIT 63Wh Battery!!! Cells:3 Cells recharge cycles:500 Operation time: Around 1.5-3.5hours Compatible Part Number: WY9DX RJ40G 01K2CF 075X16 0WK3F1 0M3KCN 005R42. Compatible Model: for Dell Latitude 14 5420 CHKFM FDTCY XPC5H series for Dell Latitude 15 5520 39V1H FPKNM series; for Dell Precision 15 3560 3H45Y 4MTF7 758J7 7RV10 F3T9T series.