Lenovo 0A36303 Thinkpad Battery 70++, 9 Cell High Capacity For L & T Series: Features & BenefitsLithium-Ion (Li-Ion) technology9 cell system batteryBattery energy (Watt-hours): 94 WhCompatible with the ThinkPad External Battery Charger (40Y7625)Compatible with T410, T420, T430, T510, T520, T530, W510, W520, W530, L410, L412, L420, L421, L430, L510, L512, L520 and L53