Tiger Direct has the Sony IT VAIO Standard Capacity Sheet Battery for S Series 13.3-Inch laptops - Black (VGP-BPSC24) for $24 with free shipping on $25+. Sells for over $50 elsewhere. Compatible with SA, SB, and SC series laptops, can be charged independently, and contains a 4400mAh battery. Update laptop BIOS if you have charging issues.
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