{"product_id":"nokia-303-replacement-battery-37v-1300mah-li-ion","title":"BP-3L Nokia 303 Replacement Battery 3.7V 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 303 \/ Lumia 710 \/ Asha 303 — 3.7V Li-ion Replacement Battery (BP-3L)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1300mAh Li-ion replacement cell for the Nokia BP-3L battery slot. It fits the Nokia 303, 603, Lumia 710, Asha 303, and seven additional Nokia models that share the same BP-3L footprint. Dimensions are 66.00 × 43.90 × 4.60mm — the same physical envelope as the original.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-model Nokia platform fit:\u003c\/strong\u003e\n    The 303, 603, Lumia 710, and Asha 303 share the BP-3L connector pinout and BMS handshake voltage thresholds. One cell covers the full range because Nokia standardised the charge IC communication across these models.\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 Lumia 710 and Asha 303. The BMS accepted the charge handshake on the first cycle and held cutoff at 4.2V without thermal flags.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing this cell, run one complete discharge to the auto-shutoff point before recharging. Nokia's fuel gauge IC calibrates its coulomb counter against the actual discharge curve — skipping this step causes the percentage display to read incorrectly for the first several cycles.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Lumia 710 and Asha 303 report wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eNokia's fuel gauge IC stores a discharge profile from the original cell. When a new cell goes in, the IC still references that old curve, so the percentage it displays drifts from actual state-of-charge. The fix is one full discharge-to-shutoff followed by an uninterrupted charge to 100%. After that single cycle, the coulomb counter resets its baseline to the new cell's actual capacity and the percentage readout stabilises.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the modem or screen draws a current spike and the cell voltage drops below the BMS protection threshold — even though the gauge still shows charge remaining. It is a voltage-under-load event, not a capacity problem. A new cell behaves this way before the fuel gauge IC has mapped its actual discharge curve. Complete the first full calibration cycle and the shutoff point will track correctly; the BMS cutoff sits at approximately 3.0V under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405022199898,"sku":"BWCS-NK3LXL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405022232666,"sku":"BWCS-NK3LXL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405022265434,"sku":"BWCS-NK3LXL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK3LXL-1.webp?v=1779369842","url":"https:\/\/batteryweb.com\/products\/nokia-303-replacement-battery-37v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}