{"product_id":"dell-latitude-9440-2-in-1-replacement-battery-1155v-5150mah-li-polymer","title":"Dell Latitude 9440 2-in-1 Replacement Battery 11.55V 5150mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eDell Latitude 9440 \/ 9450 2-in-1 — 11.55V Li-Polymer Replacement Battery (GT6TK \/ K2CPY)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is an 11.55V Li-Polymer replacement battery rated at 5150mAh (59.48Wh), built to fit the Dell Latitude 9440 2-in-1 and Latitude 9450 2-in-1. It replaces OEM part numbers GT6TK and K2CPY directly. Install it when the original cell has lost capacity, stopped charging, or is triggering low-battery warnings earlier than expected.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLatitude 9440 and 9450 2-in-1 compatibility:\u003c\/strong\u003e\n    Both models share the same 11.55V battery rail, physical connector, and BMS handshake protocol. The same cell fits both because Dell used a common power platform across this generation of convertible Latitude hardware.\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 Latitude 9440 platform. The BMS communicated correctly with the Dell EC, reported accurate state-of-charge data, and held voltage within spec across the full discharge curve.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003ePost-install calibration — Latitude 9440 \/ 9450:\u003c\/strong\u003e\n    After fitting this battery, run the laptop down to hibernate-cutoff on battery power only, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on these models.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Latitude 9440 shuts down at 20–30% after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Dell Latitude 9440 uses a fuel gauge IC that builds a discharge model based on the old cell's characteristics. When a new cell is installed, that model is wrong — the IC predicts a voltage cliff earlier than the new cell actually hits one. This causes the laptop to call for shutdown at 20–30% displayed charge, even though usable capacity remains. Running two to three full discharge-and-charge cycles forces the fuel gauge to recalibrate against the new cell's actual voltage curve. After calibration, reported percentage and real capacity align correctly.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBIOS reporting battery health as \"poor\" or \"replace soon\" immediately after install\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis warning appears because the Dell BIOS reads health data stored in the old battery's EEPROM and compares it against expected parameters for a new cell — the mismatch triggers the alert. The new cell has no degradation data yet, so the BIOS flags the absence as a fault. Run the battery learn cycle: discharge fully to hibernate, then charge to 100% without interruption. On the next boot, the BIOS re-evaluates and the warning clears once it reads the updated state-of-charge data from the new cell.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409529405530,"sku":"BWCS-DEL945NB-1","price":98.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409529438298,"sku":"BWCS-DEL945NB-2","price":116.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409529471066,"sku":"BWCS-DEL945NB-3","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-DEL945NB-1.webp?v=1779579904","url":"https:\/\/batteryweb.com\/products\/dell-latitude-9440-2-in-1-replacement-battery-1155v-5150mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}