{"product_id":"yashica-replacement-battery-37v-750mah-li-ion","title":"BL-5B Yashica Replacement Battery 3.7V 750mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eYashica Nokia BL-5B — 3.7V Li-ion Replacement Battery (BL-5B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 750mAh Li-ion cell replacing the original Nokia BL-5B battery. It fits Nokia smartphones that shipped with the BL-5B from the factory. Physical dimensions are 46.20 × 34.14 × 5.68mm — confirm these match your current cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNokia BL-5B platform fit:\u003c\/strong\u003e\n    Nokia built several mid-range handsets around the same BL-5B form factor and 3.7V power rail. The shared footprint, connector tab placement, and cell voltage mean one replacement cell covers the entire BL-5B device family without any modification.\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 BL-5B compatible hardware. The BMS accepted charge current cleanly, voltage held stable across light and moderate screen loads, and the protection circuit tripped correctly at the low-voltage cutoff threshold.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    On first use after fitting, run one complete discharge from 100% down to automatic power-off before recharging fully. This lets the phone's fuel gauge IC map the new cell's actual discharge curve and report accurate percentages going forward.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the phone reports wrong battery percentage after fitting a new BL-5B cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eNokia's fuel gauge IC stores a learned discharge curve from the original cell in memory. When a new cell with a slightly different internal resistance and discharge profile is fitted, the stored curve no longer matches the real voltage-to-capacity relationship. The phone reads voltage and maps it against the old curve, so the percentage shown is often off by 10–20%. One full discharge-charge cycle forces the coulomb counter to re-anchor its calibration to the new cell.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the new cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC is still running the old cell's curve and the phone hits a voltage cliff earlier than the percentage display suggests. Under load from the modem or display backlight, the cell voltage drops faster than a fully calibrated gauge would predict, triggering a protective shutdown before the displayed percentage reaches zero. It is not a faulty cell — it is an uncalibrated gauge. Run one complete discharge to power-off and a full charge back to 100%, then check whether the shutdowns stop. If the cell voltage at shutdown is above 3.4V, the gauge is still recalibrating.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409476157530,"sku":"BWCS-NK5BXL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409476190298,"sku":"BWCS-NK5BXL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409476223066,"sku":"BWCS-NK5BXL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK5BXL-1.webp?v=1779579814","url":"https:\/\/batteryweb.com\/products\/yashica-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}