Description: 1) Battery type: Li-ion 2) Voltage: 14.8 V 3) Capacity: 4400 mAh 4) Color: silver 5) Models Compatible: W1, W1G, W1Ga, W1Gc, W1N, W1Na, W1V Series, W1000, W1000G, W1000Ga, W1000Gc, W1000N, W1000Na, W1000V Series 6) Replacement Part Number: 90-N901B1000, A42-W1