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B87S BIOS Battery CMOS Battery Cmos Memory CR1220 with Solder Tag 3V Suitable for Laptop Toshiba IBM Lenovo Packard CMOS Time Bios Battery: Amazon.co.uk: Computers & Accessories
Replace the BIOS Battery on an IBM Thinkpad 600X Cheaply : 7 Steps - Instructables
Amazon.com: Synergy Digital CMOS/BIOS Battery, Compatible with IBM ThinkPad X23 CMOS/BIOS, (Lithium, 3V, 200mAh) Ultra High Capacity, Replacement for IBM 02K6486 Battery : Health & Household