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Amazon.com: Dentsing 11.1V 44Wh/4000mAh C31-X402 Laptop Battery Compatible with ASUS VivoBook S300 S300C S300CA S300E S400 S400C S400CA S400E X402C X502C Series Notebook : Electronics
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BattPit: Laptop Battery Replacement for Asus VivoBook S400C, C31-X402, VivoBook S300, VivoBook S400, VivoBook X402 (11.1V 4000mAh 44Wh) - Walmart.com
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C31-x402 11.1v 44wh Laptop Battery For Asus S300 S400c S400ca S400e F402c C21-x402 C31-x402 4000mah - Laptop Batteries - AliExpress
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LMDTK New C31 X402 Laptop Battery For ASUS VivoBook S300 S400 S300C S300CA S300E S400C S400CA S400E|Laptop Batteries| - AliExpress
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