{"product_id":"hp-presario-cq50-replacement-battery-3v-200mah-lithium","title":"HP Presario CQ50 CMOS Battery Replacement 3V 200mAh 417076-001","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eHP Presario CQ50 \/ CQ60 \/ CQ70 — 3V Lithium CMOS Backup Battery (417076-001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is the 3V lithium coin cell that backs the CMOS circuit and real-time clock on HP Presario and Pavilion motherboards. It fits the Presario CQ50, CQ60, CQ70, Pavilion DV2000, and 890+ additional HP notebook models. Capacity is 200mAh (0.6Wh), matching the original HP part number 417076-001.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCQ50 \/ CQ60 \/ CQ70 \/ DV2000 platform fit:\u003c\/strong\u003e\n    These models share the same motherboard connector footprint and CMOS retention circuit. The cell dimensions are 20.00 × 20.00 × 3.80mm — the contact spring and board clearance are matched to this profile across the entire CQ and DV2000 series.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We seated this cell on a CQ60 board and measured open-circuit voltage at 3.0V. The CMOS circuit held BIOS settings and RTC data through repeated mains disconnections with no checksum errors triggered.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation BIOS step:\u003c\/strong\u003e\n    After fitting the new cell, enter BIOS immediately and set the correct date and time, then save and exit. The RTC circuit powers down to minimum retention state during the swap, and the clock defaults to a fixed date — it will not self-correct. Skipping this step causes timestamp errors in the OS and may trigger repeated boot warnings.\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 2000 after every power cycle on the CQ50\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe CQ50 RTC circuit requires a minimum of 2.8V from the CMOS cell to retain the clock value when mains power is absent. Once the original cell drops below that threshold, the clock resets to a factory default — typically January 1, 2000 — on every cold boot. This happens even if the laptop otherwise functions normally on AC power, because the main battery and AC adapter do not supply the RTC rail when the system is fully off. Replacing the coin cell and resetting the clock in BIOS resolves it 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 on first boot after a cell swap means the CMOS SRAM lost all stored values during the replacement — the contents are now invalid and the BIOS flags the mismatch. This is expected behaviour, not a fault with the new cell. Press F1 or F2 (whichever your CQ model prompts) to enter BIOS setup, reload defaults, set the correct date and time, and save. The error will not return as long as the new cell holds above 2.8V retention voltage.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43340119244890,"sku":"BWCS-HQC600BU-1","price":20.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43340119277658,"sku":"BWCS-HQC600BU-2","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43340119310426,"sku":"BWCS-HQC600BU-3","price":25.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HQC600BU-1.webp?v=1778366843","url":"https:\/\/batteryweb.com\/products\/hp-presario-cq50-replacement-battery-3v-200mah-lithium","provider":"BatteryWeb","version":"1.0","type":"link"}