HWG C31-X502 Battery (11.1V 4000mAh) for Asus X502 X502c X502ca Pu500c Pu500ca S500c S500ca C21-X502 C31-X502 Battery type: Li-ion; Voltage: 11.1V; Capacity: 4000mAh; Cells: 6-cell; Color: Black Compatible Models: Asus Vivobook X502 X502c X502ca S500 S500c S500ca V500c Series Asus Pu500c Pu500ca Series 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. Every battery has passed factory testing; Durable grade A cells battery; Quality assurance. 24 x 7 email support; 12-month hassle-free warranty. Fulfilled by Amazon.