{"product_id":"dell-vostro-1220-replacement-battery-111v-4400mah-li-ion","title":"Dell Vostro 1220 Replacement Battery 11.1V 4400mAh 312-0140","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell Vostro 1220 \/ 1220n — 11.1V Li-ion Replacement Battery (312-0140)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 11.1V, 4400mAh Li-ion battery replaces the original cell in the Dell Vostro 1220 and 1220n notebooks. It matches OEM part numbers 312-0140, 429-14244, J130N, and N887N. Rated at 48.84Wh, it restores full portable operation when the factory battery no longer holds a charge.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVostro 1220 and 1220n compatibility:\u003c\/strong\u003e\n    Both models share the same 11.1V battery bay, connector pinout, and BMS communication protocol. One cell fits both without any adapter or modification.\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 a Vostro 1220 unit. The BMS handshake completed correctly, the BIOS accepted the cell without fault flags, and charge current tapered normally at the 4400mAh ceiling.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle recalibration on the Vostro 1220:\u003c\/strong\u003e\n    After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Vostro 1220 BIOS reports poor battery health after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Vostro 1220 stores charge history and health data in the battery's EEPROM. When a new cell arrives, that EEPROM contains factory defaults the BIOS doesn't recognise as a valid charge history. The system flags this as degraded or unknown health. Running one complete discharge-to-hibernate then a full uninterrupted charge writes fresh data to the learn cycle and resolves the warning without any firmware update.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on the gauge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The old curve is still in memory, so the percentage reading drifts from the real state of charge. Under combined CPU and display load, the cell hits a voltage cliff before the gauge catches up, and the system shuts down to protect itself. Run two full discharge-to-hibernate and full recharge cycles — the fuel gauge IC recalibrates against the new cell and the cutoff stabilises above 10V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409817436250,"sku":"BWCS-DE1220HB-1","price":104.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409817469018,"sku":"BWCS-DE1220HB-2","price":119.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409817501786,"sku":"BWCS-DE1220HB-3","price":130.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DE1220HB-1.webp?v=1779581091","url":"https:\/\/batteryweb.com\/products\/dell-vostro-1220-replacement-battery-111v-4400mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}