{"product_id":"nokia-53-2020-replacement-battery-385v-3900mah-li-polymer","title":"LC-440U Nokia 5.3 2020 Replacement Battery 3.85V 3900mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 5.3 2020 — 3.85V Li-Polymer Replacement Battery (LC-440U)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3900mAh Li-Polymer replacement battery for the Nokia 5.3 2020 (TA-1223). It matches the OEM LC-440U specification at 3.85V nominal voltage and 15.02Wh energy rating. When the original cell degrades and the phone stops holding charge through a normal day, this battery restores full cell capacity.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNokia 5.3 \/ TA-1223 compatibility:\u003c\/strong\u003e\n    The 5.3 and TA-1223 are regional variants of the same hardware platform. They share an identical battery bay, connector pinout, and charge IC configuration — one cell fits both without 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 the 5.3 platform. The BMS accepted the cell without flagging an error, charge current ramped correctly through CC-CV stages, and the fuel gauge IC began tracking state-of-charge from the first cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration tip:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Nokia 5.3 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Nokia 5.3 uses a coulomb counter inside the fuel gauge IC to estimate remaining capacity. That counter was calibrated to the discharge curve of the original, degraded cell. A fresh 3900mAh cell has a different voltage-to-capacity curve, so the IC reads incorrectly until it maps the new cell. Run one full discharge to around 3.0V under normal use, then charge uninterrupted to 100% without unplugging early. After that single cycle, the percentage readout will track accurately.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC still holds the old cell's voltage-sag profile in memory. Under peak load — mobile data, screen at full brightness, or a background sync — the new cell briefly dips below the voltage floor the IC expects at 20–30%, triggering an emergency shutdown. The phone is not faulty and the battery is not defective. Complete two full discharge-charge cycles without fast charging to let the IC relearn the sag characteristics of the new cell. After calibration, the phone should sustain load through single-digit percentages without cutting out.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391868829786,"sku":"BWCS-NKT122SL-1","price":32.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391868862554,"sku":"BWCS-NKT122SL-2","price":37.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391868895322,"sku":"BWCS-NKT122SL-3","price":40.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKT122SL-1.webp?v=1779142430","url":"https:\/\/batteryweb.com\/products\/nokia-53-2020-replacement-battery-385v-3900mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}