{"product_id":"nec-versa-e660-replacement-battery-111v-6600mah-li-ion","title":"NEC Versa E660 Replacement Battery 11.1V 6600mAh BP-8089","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNEC Versa E660 \/ E680 \/ M500 — 11.1V Li-ion Replacement Battery (442677000001)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.1V, 6600mAh (73.26Wh) Li-ion battery pack for the NEC Versa E660, Versa E680, and Versa M500 notebook computers. It replaces the original cell when the system no longer holds charge or powers on without AC. Direct fit — same voltage rail, connector pinout, and BMS communication protocol as the factory pack.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVersa E660 \/ E680 \/ M500 platform fit:\u003c\/strong\u003e\n    All three models draw from the same battery bay spec — identical 11.1V nominal rail, matching connector, and shared BMS handshake. One cell replaces across all three without adapter or firmware change.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this pack on a Versa E660 and logged BMS communication through Windows battery reporting. The cell negotiated correctly, charge current stepped down at the correct threshold, and the pack reached full capacity without a BMS lockout event.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the Versa platform:\u003c\/strong\u003e\n    After installing, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on Versa-series systems.\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 after fitting a new cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Versa BIOS stores learned capacity data from the previous cell in EEPROM. When a new pack is installed, the old data doesn't clear automatically — the BIOS compares current readings against a degraded baseline and flags the new cell as unhealthy. This is a firmware artefact, not a fault with the replacement cell. Running one full discharge-to-cutoff cycle followed by an uninterrupted charge to 100% rewrites the learn cycle data and resolves the warning on next boot.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shutting down at 20–30% shown on the fuel gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't calibrated against the new cell's actual discharge curve. The reported percentage and real cell voltage diverge — the system hits the low-voltage protection threshold while the gauge still shows charge remaining. It's most visible under full CPU and display load, where current draw accelerates the voltage drop. Run two or three full discharge-to-hibernate cycles and the gauge IC realigns; unexpected shutdowns stop once the curve is relearned.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43410845696090,"sku":"BWCS-MT8389HB-1","price":86.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43410845728858,"sku":"BWCS-MT8389HB-2","price":101.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43410845761626,"sku":"BWCS-MT8389HB-3","price":112.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MT8389HB-1.webp?v=1779581320","url":"https:\/\/batteryweb.com\/products\/nec-versa-e660-replacement-battery-111v-6600mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}