{"product_id":"dell-latitude-14-5491-replacement-battery-76v-8800mah-li-ion","title":"Dell Latitude 14 5491 Replacement Battery 7.6V 8800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell Latitude 14 5491 — 7.6V Li-ion Replacement Battery (GJKNX)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 7.6V Li-ion battery replaces the original GJKNX cell in the Dell Latitude 14 5491 and Latitude 15 5591, along with the Latitude 5280 and 5290 series. Capacity is 8800mAh (66.88Wh) — matched to the OEM specification. It also covers additional Latitude business notebooks sharing the same connector, voltage rail, and BMS handshake.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLatitude 5000-series compatibility:\u003c\/strong\u003e\n    These models share a common 7.6V dual-cell architecture, identical 3-pin smart connector, and the same Dell EC firmware handshake. The BMS communicates battery identity via EEPROM, so the BIOS recognises this cell as it would the original.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a Latitude 5491 and cycled it through Dell's battery diagnostics via SupportAssist. The BMS reported correct voltage, current, and temperature readings across charge and discharge. No EC communication faults were logged.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on Latitude hardware:\u003c\/strong\u003e\n    After installing, run a full discharge to hibernate cutoff, then charge uninterrupted to 100% without using the laptop. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Dell Latitude machines.\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 immediately after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Latitude 5491 BIOS reads health data from the battery's EEPROM chip, not from live voltage readings. When a new cell is installed, that EEPROM starts at zero charge cycles, but the BIOS fuel gauge IC has not yet calibrated against the new cell's actual capacity curve. This mismatch triggers a false \"poor health\" warning in Dell SupportAssist and the BIOS battery page. One full discharge-to-hibernate followed by an uninterrupted charge to 100% completes the learn cycle and clears the flag.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eLaptop shuts down at 20–30% charge shown on screen\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The new cell hits a voltage cliff at higher state-of-charge than the gauge predicts, so the system cuts power before the display reaches 0%. It is a calibration gap, not a cell fault. Run two full discharge-to-hibernate cycles with an uninterrupted recharge each time. After the second cycle, the gauge re-maps the curve and the cutoff point drops back to the correct level near 3.0V per cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409708253274,"sku":"BWCS-DEL145NB-1","price":83.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409708286042,"sku":"BWCS-DEL145NB-2","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409708318810,"sku":"BWCS-DEL145NB-3","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEL145NB-1.webp?v=1779580499","url":"https:\/\/batteryweb.com\/products\/dell-latitude-14-5491-replacement-battery-76v-8800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}