{"product_id":"nec-lavie-pc-ll7509d-replacement-battery-148v-4400mah-li-polymer","title":"NEC Lavie PC-LL7509D Replacement Battery 14.8V 4400mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNEC Lavie PC-LL7509D Series — 14.8V Li-Polymer Replacement Battery (APA000084900)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 14.8V, 4400mAh lithium-polymer battery replaces the original cell in the NEC Lavie PC-LL7509D and related models including the PC-LL750AD, PC-LL7709DT, and PC-LL770AD. It matches the OEM voltage rail and connector pinout for direct installation. Capacity is 65.12Wh, identical to the original specification.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLavie series compatibility:\u003c\/strong\u003e\n    These Lavie notebooks share the same 14.8V four-cell Li-Polymer architecture, connector housing, and BMS communication protocol — which is why one cell covers the full model range listed above.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on the Lavie platform. The BMS handshake completed correctly, charge termination triggered at 16.8V, and the protection circuit tripped as expected at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-installation calibration — Lavie BIOS battery learn cycle:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge until the laptop hibernates, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Lavie hardware.\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 the new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Lavie BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's reported values. When a fresh cell is installed, the EEPROM data does not match the learned cycle history, so the BIOS flags it as degraded. This is not a fault with the replacement cell — it is a firmware artefact. Run one full discharge-to-hibernate followed by an uninterrupted full charge. After two to three cycles the BIOS recalculates health from live data and the warning clears.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on the fuel gauge\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 IC inherited capacity data from the old, degraded cell and cuts system power when voltage drops below its learned threshold — even though the new cell still has usable charge remaining. Complete two full discharge-to-hibernate cycles followed by full uninterrupted charges. After calibration, the fuel gauge tracks the new cell accurately and the early shutdowns stop. If the issue persists beyond three cycles, check that the cell resting voltage reads above 14.4V before boot.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410830360666,"sku":"BWCS-NM6000NB-1","price":95.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 2 Year","offer_id":43410830393434,"sku":"BWCS-NM6000NB-2","price":112.99,"currency_code":"USD","in_stock":false},{"title":"Warranty 3 Year","offer_id":43410830426202,"sku":"BWCS-NM6000NB-3","price":125.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NM6000NB-big.webp?v=1779581286","url":"https:\/\/batteryweb.com\/products\/nec-lavie-pc-ll7509d-replacement-battery-148v-4400mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}