{"product_id":"compaq-presario-a900-replacement-battery-108v-4400mah-li-ion","title":"Compaq Presario A900 10.8V Replacement Battery 436281-241","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eCompaq Presario A900 \/ C700 Series — 10.8V Li-ion Replacement Battery (436281-241)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 10.8V, 4400mAh Li-ion battery replaces the original pack in the Compaq Presario A900 and C700 series notebooks. It covers a broad range of models within those lines, all sharing the same voltage rail and connector format. OEM part numbers 452057-001, HSTNN-DB42, and HSTNN-LB42 are among the many cross-references this cell satisfies.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA900 and C700 platform fitment:\u003c\/strong\u003e\n    Both series run a common 10.8V three-cell-series architecture with the same physical connector and BMS handshake protocol. That shared design is why one cell covers both lines without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on a Presario C700 unit. The BMS negotiated correctly, charge termination triggered at the expected voltage ceiling, and no fault codes were logged by the notebook.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-install discharge cycle on Presario units:\u003c\/strong\u003e\n    After fitting, run the laptop on battery only until it hits hibernate cutoff — do not interrupt the cycle. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every 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\"\u003eBIOS reporting poor battery health immediately after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Presario BIOS reads health data from the battery's EEPROM on first contact. The new cell's EEPROM carries factory default figures that do not match the notebook's stored discharge history, so the system flags it as degraded before a single cycle has run. This is a data mismatch, not a fault with the cell itself. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% and the BIOS learn cycle will rewrite its reference data against the new cell's actual performance.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down abruptly while the gauge still shows 20–25% remaining\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 chemistry. The IC is still using charge-curve data from the old, degraded pack, so its percentage estimate diverges from actual cell voltage under load. When the CPU and display draw peak current simultaneously, the cell voltage drops past the BMS cutoff threshold before the gauge has counted down to zero. Run two to three full discharge-and-charge cycles without interruption — by the third cycle the fuel gauge IC will have recalibrated and the shutdown should move to below 5% remaining.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43411621544026,"sku":"BWCS-CV3000NB-1","price":65.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43411621576794,"sku":"BWCS-CV3000NB-2","price":75.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43411621609562,"sku":"BWCS-CV3000NB-3","price":83.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-CV3000NB-1.webp?v=1779581402","url":"https:\/\/batteryweb.com\/products\/compaq-presario-a900-replacement-battery-108v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}