{"product_id":"compaq-presario-cq35-100-replacement-battery-108v-4400mah-li-ion","title":"Compaq Presario CQ35-100 Replacement Battery 10.8V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCompaq Presario CQ35-100 Series — 10.8V Li-ion Replacement Battery (HSTNN-C54C)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 4400mAh (47.52Wh) Li-ion battery replaces the original HSTNN-C54C and cross-references including 530801-001, HSTNN-IB82, HSTNN-LB93, and RT09. It fits the Compaq Presario CQ35-100 series and over 96 related CQ35 variants. The connector, voltage rail, and BMS communication profile match the OEM specification for this notebook line.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCQ35 series fit:\u003c\/strong\u003e\n    The CQ35-100 through CQ35-102 and related TU\/TX models share the same 10.8V three-cell-pair Li-ion architecture, identical bottom-panel connector pinout, and the same BMS handshake protocol — which is why one part number covers the full range.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, idle draw, and sustained CPU-plus-display load. The BMS held the charge cutoff correctly at full capacity and did not trip on the CQ35's moderate power draw profile.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration cycle:\u003c\/strong\u003e\n    After fitting, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false \"poor health\" warning that appears in HP Support Assistant after any cell swap on this platform.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the CQ35 BIOS reports a new battery as degraded or unknown\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe CQ35 platform reads EEPROM data embedded in the battery pack to calculate health percentage. When a new cell arrives, that EEPROM reports a factory baseline that does not match the BIOS's stored discharge history from the old pack. The BIOS interprets the mismatch as a worn cell and flags poor health immediately. One full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS enough data to recalibrate its fuel gauge IC against the new cell's actual capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff, not a capacity problem. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC predicts — the BIOS triggers an emergency shutdown before the percentage reaches zero. It happens most often in the first few cycles before calibration. Run two full discharge-to-hibernate cycles charged back to 100% each time, and confirm the battery voltage under load reads above 10.0V using HWMonitor or BatteryInfoView.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410813059162,"sku":"BWCS-HDV32NB-1","price":92.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410813091930,"sku":"BWCS-HDV32NB-2","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410813124698,"sku":"BWCS-HDV32NB-3","price":113.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HDV32NB-1.webp?v=1779581212","url":"https:\/\/batteryweb.com\/products\/compaq-presario-cq35-100-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}