Stay unplugged longer with these genuine Think Pad batteries. These rechargeable batteries use Lithium-Ion technology & can be used as replacement for aging system batteries or as a convenient spare battery. Features Lithium-Ion (Li-Ion) technology 9 cell system battery Battery energy (Watt-hours): 94 Wh Compatible with the Think Pad External Battery Charger (40Y7625) Compatible with T410/20/30, T510/20/30, W510/20/30, L410/12/20/21/30, L510/12/20/30 Think Pad L530, L430, L520, L421, L420, L512, L412, L510, L410, T530 (dual core), T530 (quad core), T430, T430i, T520 (dual core), T520 (quad core), T420, T510, T510i, T410, T410i, W530, W520, W510