{"product_id":"ibm-thinkpad-570-replacement-battery-3v-200mah-lithium","title":"IBM ThinkPad 570 CMOS Battery 3V 200mAh 02K6541","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eIBM ThinkPad 570 Series — 3V Lithium CMOS Backup Battery (02K6541)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3V, 200mAh lithium coin cell that powers the RTC circuit and SRAM on IBM ThinkPad 570, 570E, 570X, and 570Z motherboards. It keeps BIOS settings, date, and time intact when mains power is removed. When this cell drops below the CMOS retention threshold, the system loses configuration on every power cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThinkPad 570 series compatibility:\u003c\/strong\u003e\n    The 570, 570E, 570X, and 570Z share the same CMOS socket and connector pinout. All four models draw from the same RTC backup rail, so one part number covers the full range without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We confirmed open-circuit voltage at 3.0V and verified the BMS-free cell holds retention voltage across the SRAM address space without voltage sag on the RTC rail.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install BIOS step:\u003c\/strong\u003e\n    After fitting the new cell, enter BIOS setup immediately and set the correct date and time, then save and exit. The RTC circuit resets to a default value after any power interruption — it will not self-correct, so this step is mandatory.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS clock resetting to a default date after every power cycle\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe ThinkPad 570 RTC circuit requires a minimum of 2.8V from the CMOS cell to retain clock data in SRAM. Once the cell drops below that threshold, the RTC loses power the moment AC and the main battery are disconnected. The system then boots with the default factory timestamp — often January 1, 2000. Replacing the cell and setting the correct time in BIOS resolves this permanently.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eCMOS checksum error on boot after fitting a new coin cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA checksum error immediately after a new cell install usually means the BIOS compared stored settings against corrupted SRAM data left by the depleted cell. The cell itself is not the fault — the stored configuration is. Enter BIOS setup, load defaults, set your date and time, then save and exit. The checksum recalculates on the next boot and the error clears.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43339854741594,"sku":"BWCS-IBR500BU-1","price":20.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43339854774362,"sku":"BWCS-IBR500BU-2","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43339854807130,"sku":"BWCS-IBR500BU-3","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IBR500BU-1.webp?v=1778366843","url":"https:\/\/batteryweb.com\/products\/ibm-thinkpad-570-replacement-battery-3v-200mah-lithium","provider":"BatteryWeb","version":"1.0","type":"link"}