Oneda New Laptop Battery for Asus A46 A56 K46 K56 R405 R505 S40 S405 S505 S56 U48 U58 V550 Ultrabook ; VivoBook S550 S550C S550CA S550CM ; P/N: A31-K56 A32-K56 A41-K56 A42-K56 [8-cell / 4400mAh/65Wh] Brand: Oneda; Battery type: Li-ion; Voltage: 14.8V; Cells: 8-cell; Actual Capacity: 4400mAh/65Wh; Color: Black. Improve the service guarantee, Satisfaction guaranteed and backed by a one year replacement warranty. Oneda new high-quality batteries, 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection. Automatic power cut off at high electric current, voltage or temperature ensures safety and extended battery life. The actual operation time will depend on how much electricity is required by the device and how you use it.