{"product_id":"compaq-presario-cq35-100-replacement-battery-108v-6600mah-li-ion","title":"Compaq Presario CQ35-100 10.8V Replacement Battery HSTNN-C54C","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 is a 10.8V, 6600mAh Li-ion battery for the Compaq Presario CQ35-100 series notebook. It replaces OEM part numbers HSTNN-C54C, HSTNN-IB82, HSTNN-IB83, RT09, and several others listed below. The cell fits the standard bay on CQ35-100 through CQ35-102TU and the broader CQ35 lineup sharing this battery form factor.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCQ35 series compatibility:\u003c\/strong\u003e\n    These models share a common 10.8V bus, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers 100-plus CQ35 variants. The BMS communicates charge state back to the BIOS over the SMBus line on pins 4 and 5.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a CQ35-101TX unit. The BMS initialised within two minutes of seating, BIOS detected the pack without prompting, and the charge controller stepped correctly through bulk, absorption, and float phases to 10.8V.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install discharge cycle:\u003c\/strong\u003e\n    After fitting this cell, run it down to hibernate-cutoff under normal workload, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to complete against the new cell and clears the inaccurate health warning that appears after swapping packs.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as poor immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe BIOS stores charge-cycle count, design capacity, and health data in EEPROM on the original battery pack. When a new cell goes in, that EEPROM data resets, and the BIOS flags the pack as degraded before it has gathered any real data. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS battery learn cycle writes fresh baseline data and the health warning clears on the next boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down hard at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge predicts 20–30% remaining using old cell data, but the real cell voltage drops below the BIOS low-voltage cutoff — typically around 9.0V under CPU and display load — before the gauge catches up. The laptop cuts power to protect the cells. Complete two to three full discharge-and-charge cycles and the fuel gauge IC recalibrates its model against the new chemistry. After that, the reported percentage and actual cutoff align.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409819238490,"sku":"BWCS-HDV32HB-1","price":125.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409819271258,"sku":"BWCS-HDV32HB-2","price":145.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409819304026,"sku":"BWCS-HDV32HB-3","price":158.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HDV32HB-1.webp?v=1779581113","url":"https:\/\/batteryweb.com\/products\/compaq-presario-cq35-100-replacement-battery-108v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}