{"product_id":"philips-freevents-x67-1200-replacement-battery-111v-4400mah-li-ion","title":"Philips FREEVENTS X67 1200 Replacement Battery 11.1V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003ePhilips FREEVENTS X67 1200 \/ 11NB5800 — 11.1V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Philips FREEVENTS X67 1200 and 11NB5800 notebooks. It fits where the stock battery sits, uses the same connector, and communicates with the BIOS over the same SMBus line. Capacity is drawn directly from product data — 4400mAh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFREEVENTS X67 1200 and 11NB5800 compatibility:\u003c\/strong\u003e\n    Both models share an identical battery bay, the same 11.1V three-cell rail, and the same SMBus handshake protocol — so one replacement cell works across both. The BMS firmware responds to the same charge-termination signal the original charger sends.\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 the FREEVENTS platform and confirmed BMS recognition on the first insertion. Charge current tapered correctly at top-of-charge, and the cutoff triggered cleanly at the low-voltage threshold without a hard shutdown event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration on the FREEVENTS X67:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to the hibernate cutoff point, then charge uninterrupted to 100% without pulling the adapter. This resets the BIOS battery learn cycle and clears the inaccurate health or low-capacity 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  \u003cp class=\"bpw-desc-p\"\u003eThe FREEVENTS BIOS stores capacity and health data in EEPROM tied to the original cell's charge history. When a new cell goes in, the BIOS compares live readings against that stale EEPROM baseline and flags a mismatch as poor health. This is not a fault with the replacement cell — it is a data conflict. Run one full discharge-to-hibernate followed by a full uninterrupted charge to 100%. The BIOS battery learn cycle rewrites the EEPROM baseline against the new cell's actual capacity curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop cuts off at 20–30% remaining shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC's state-of-charge map drifts out of sync with the new cell's voltage curve. The gauge predicts 20–30% remaining but the cell's actual voltage under combined CPU and display load has already dropped past the BMS cutoff threshold. The laptop shuts down because real cell voltage collapsed, not because the displayed percentage hit zero. Run two or three full discharge-to-hibernate then charge-to-100% cycles — this re-anchors the fuel gauge IC endpoints to the new cell and the percentage readout will track accurately from that point.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410818433114,"sku":"BWCS-AT1020NB-1","price":67.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410818465882,"sku":"BWCS-AT1020NB-2","price":79.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410818498650,"sku":"BWCS-AT1020NB-3","price":87.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AT1020NB-big.webp?v=1779581181","url":"https:\/\/batteryweb.com\/products\/philips-freevents-x67-1200-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}