{"product_id":"nokia-5300-xpressmusic-replacement-battery-37v-750mah-li-ion","title":"Nokia BL-5B 5300 XpressMusic Replacement Battery 3.7V 750mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eNokia 5300 XpressMusic \/ 2610 \/ 3220 — 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 replacement for the Nokia BL-5B cell. It fits the 5300 XpressMusic, 2610, 3220, 3230, and over 20 additional Nokia handsets that share the same BL-5B footprint and connector. Physical dimensions are 46.20 × 34.14 × 5.68mm — measure your original before ordering if you are unsure.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBL-5B platform compatibility:\u003c\/strong\u003e\n    Nokia used the BL-5B cell across a wide range of mid-2000s handsets because they share the same three-contact connector, voltage rail, and physical envelope. One cell works across all of them without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell on a 5300 XpressMusic and monitored BMS handshake and charge termination. The protection circuit responded correctly to charge cutoff at 4.2V and low-voltage lockout below 2.5V per cell.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first install:\u003c\/strong\u003e\n    After fitting this cell, run one full discharge down to auto-shutdown and charge back to 100% without interruption. The 5300's fuel gauge IC calibrates its coulomb counter against that first complete cycle — skipping it causes erratic percentage readings for days.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the 5300 XpressMusic reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe 5300 uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve. That curve was built around the original aged cell, not a new one. When a fresh 750mAh cell goes in, the IC's reference points no longer match actual cell behaviour, so it displays percentages that jump or stall. One full discharge-to-shutdown followed by an uninterrupted charge to 100% forces the IC to rewrite its reference curve against 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 the replacement cell\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff symptom, not a capacity fault. Under the load of the backlight, audio output, and radio simultaneously — common during music playback with the screen active — cell voltage can sag below the BMS cutoff threshold even when the fuel gauge still shows charge remaining. The fuel gauge IC is reading an uncalibrated state-of-charge, so it reports 25% while actual terminal voltage has already dropped to the cutoff point. Complete the full recalibration cycle first; if shutdowns continue after that, check that the battery contacts on the phone chassis are clean and making firm contact — oxidised contacts increase resistance and worsen voltage sag under load.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409477402714,"sku":"BWCS-NK5BXL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409477435482,"sku":"BWCS-NK5BXL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409477468250,"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\/nokia-5300-xpressmusic-replacement-battery-37v-750mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}