Sony VAIO PCG-3E2L BIOS Battery Replacement - iFixit Repair Guide
SONY Vaio PCG-6S1L Black Laptop with VGP-BPS9 Battery - AS IS / FOR PARTS ONLY | eBay
Amazon.com: Rome Tech RTC 2/V15H 15mAh 2.4v CMOS Battery for Sony VAIO VGN-FS/NR - VGN-NR350FE VGN-NS235J VGN-Z11XN VGN-SR390 VGN-240F - GRX C R F V Z A S Series BIOS CMOS Battery