Amazon.com: Rome Tech Replacement CMOS Battery for Sony Playstation 2/3 - PS2 PS3 Backup RTC BIOS Battery - 2 Wire Cable (1-Pack) : Video Games
Sony Playstation 3 PS3 Replacement Battery: BatteryClerk.com CMOS Backup
Amazon.com: Synergy Digital CMOS/BIOS Battery, Compatible with Sony VAIO PCG-SRX99 CMOS/BIOS, (Ni-MH, 2.4V, 20mAh) Ultra High Capacity, Replacement for Sony PCG-91111M Battery : Electronics