The "68+" refers to the ThinkPad Battery 68+ (48Wh, 6-cell), a hot-swappable external battery pack compatible with the T460p, T450, and other models.
 
About this item
Battery type: Li-ion; Capacity: 48Wh; Cells: 6-cell; Voltage: 10.8V.
 
Compatible Part Numbers:
0C52861 0C52862 121500146 121500147 121500148 45N1124 45N1125 45N1126
45N1127 45N1128 45N1129 45N1130 45N1131 45N1135 45N1136 45N1160 45N1738 45N1736
 
Fit for Laptop models:
Fit for ThinkPad T440 Series
Fit for ThinkPad T440s Series
Fit for ThinkPad X240 Series
Fit for ThinkPad X240s Series
Fit for ThinkPad X250 Series
Fit for ThinkPad W550 Series
Fit for ThinkPad L450 Series
Fit for ThinkPad T450 Series
Fit for ThinkPad T550 Series