Batterytec&reg; Laptop Battery for ASUS X402 C31-X402 S300 S300CA S400 S400C S400CA S400E, ASUS VivoBook S300CA X402CA. [11.1V 4000mAh, 1 Year Warranty] Battery Type: Li-ion,Capacity: 4400mAh; Voltage: 11.1V. 100% New Manufacturer. To 500 charging cycles during the lifetime of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 12 months Warranty without problems. Class A cells provide fast loads and low power consumption, chip protection offers both security and stability.