{"product_id":"nokia-81-replacement-battery-385v-3300mah-li-polymer","title":"Nokia 8.1 HE363 Replacement Battery 3.85V 3300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 8.1 \/ TA-1119 \/ TA-1128 — 3.85V Li-Polymer Replacement Battery (HE363)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.85V, 3300mAh Li-Polymer replacement battery for the Nokia 8.1 smartphone. It fits model variants TA-1119 and TA-1128 and matches OEM part numbers HE363, HE362, and HE377. Replace the original cell when the phone no longer holds charge through a full day or shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNokia 8.1 variant fit — TA-1119 and TA-1128:\u003c\/strong\u003e\n    These two SKUs share the same battery bay geometry, connector pinout, and BMS communication protocol. One cell covers both. Voltage rail and NTC thermistor position are identical across the run.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Nokia 8.1 platform. The BMS accepted the cell without fault codes, and charge IC handshake completed normally on first connection.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not working on first cycle after replacement\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the Nokia 8.1's charge IC defaults to a conservative current limit until it completes one handshake cycle with the new BMS. USB-PD negotiation requires the battery management IC to confirm cell state before the charger steps up to higher voltage. On the first charge, plug into a standard 5V charger — not a fast charger — and let it complete a full cycle. After that cycle, fast charging resumes at full rated current.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% after the cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still reading from the old cell's discharge curve stored in memory. The phone calculates remaining charge against a different voltage-to-capacity map, so it hits the low-voltage cutoff before the displayed percentage reaches zero. The fix is one full discharge below 5% followed by a complete charge to 100% with fast charging off. After that cycle, the coulomb counter re-anchors to the new cell and the shutdowns stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392016253018,"sku":"BWCS-NKT810SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392016285786,"sku":"BWCS-NKT810SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392016318554,"sku":"BWCS-NKT810SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKT810SL-1.webp?v=1779142904","url":"https:\/\/batteryweb.com\/products\/nokia-81-replacement-battery-385v-3300mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}