{"product_id":"tecno-replacement-battery-37v-1050mah-li-ion","title":"Tecno HD61 Album Compatible Battery 3.7V 1050mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eTecno HD61 Album — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V 1050mAh Li-ion battery carrying OEM part number HD61 Album. It fits the Tecno smartphone that originally shipped with this cell. Voltage and capacity match the factory specification at 3.7V and 3.89Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHD61 Album platform fit:\u003c\/strong\u003e\n    Tecno devices sharing this part number use the same voltage rail, connector pinout, and BMS handshake. Swapping to this cell does not trigger hardware mismatch warnings because the connector and communication lines are identical to the original.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, discharge, and modem-load scenarios. The BMS held cutoff correctly at both the high and low voltage thresholds, and charge termination triggered cleanly at full capacity without overrun.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration after install:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the fuel gauge IC learn the new cell's discharge curve before any 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 Tecno phone reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC stores a learned discharge model built from the old cell's behaviour. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the fresh cell. The IC reads voltage correctly but maps it to the wrong percentage point. One complete discharge-charge cycle at standard rate forces the coulomb counter to rebuild its model against the new cell, after which percentage reporting stabilises.\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 still holds the old cell's degraded voltage curve in memory. The new cell hits a steeper voltage drop under modem or screen load than the IC expects, so the phone shuts down before the displayed percentage reaches zero. It is not a defective cell — it is a calibration mismatch. Run one full discharge until automatic shutdown, then charge uninterrupted to 100% to reset the fuel gauge reference points.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405114048602,"sku":"BWCS-HFC250SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405114081370,"sku":"BWCS-HFC250SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405114114138,"sku":"BWCS-HFC250SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-HFC250SL-1.webp?v=1779369992","url":"https:\/\/batteryweb.com\/products\/tecno-replacement-battery-37v-1050mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}