{"product_id":"nokia-c1-2019-replacement-battery-38v-2300mah-li-ion","title":"Nokia S5420AP C1 2019 Replacement Battery 3.8V 2300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia C1 2019 \/ TA-1165 — 3.8V Li-ion Replacement Battery (S5420AP)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2300mAh Li-ion replacement battery for the Nokia C1 2019 smartphone, including TA-1165 variants. It matches the OEM part number S5420AP and fits the physical footprint of the original cell at 77.00 × 59.90 × 4.20mm. Install it when the original battery no longer holds charge or shuts the phone down unexpectedly.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC1 2019 and TA-1165 compatibility:\u003c\/strong\u003e\n    Both the C1 2019 and TA-1165 share the same battery bay dimensions, connector pinout, and BMS handshake protocol — a single cell covers the full variant range 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 a full discharge-charge sequence on a Nokia C1 2019 unit. The BMS accepted the cell without error flags, charge current ramped correctly into the CV phase, and the fuel gauge IC updated state-of-charge readings as expected.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle calibration on the C1 2019:\u003c\/strong\u003e\n    Disable fast charging for the first complete discharge-charge cycle after installation. The Nokia C1 2019's fuel gauge IC is calibrated against the original cell's discharge curve. Letting a full slow cycle run first gives the coulomb counter an accurate baseline before high-current charging begins.\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 C1 2019 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe C1 2019 uses a coulomb-counter-based fuel gauge IC that builds its charge model from the original cell's voltage-versus-capacity curve. When a new cell goes in, that stored curve no longer matches the actual cell chemistry, so the IC reports percentages based on stale data. The mismatch is worst in the mid-range — the phone may show 50% while the actual cell voltage is already below 3.6V. One full slow discharge to automatic shutdown followed by an uninterrupted charge to 100% lets the IC remap to the new cell. After that cycle, percentage readings stabilise.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on a freshly installed cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage-cliff problem, not a defective cell. Under peak modem or screen load, the cell briefly drops below the BMS cutoff threshold — typically around 3.2V — even though the displayed percentage suggests charge remains. The fuel gauge IC hasn't recalibrated yet, so it reports remaining capacity that the cell can't actually sustain under load. Run one full discharge-charge cycle at standard charge speed. If shutdowns persist after calibration, check that the battery connector is fully seated — a partial connection increases contact resistance and worsens voltage sag under load, dropping the cell voltage below the 3.2V cutoff faster.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391878070362,"sku":"BWCS-NKT116SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391878103130,"sku":"BWCS-NKT116SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391878135898,"sku":"BWCS-NKT116SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NKT116SL-1.webp?v=1779142480","url":"https:\/\/batteryweb.com\/products\/nokia-c1-2019-replacement-battery-38v-2300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}