{"product_id":"svp-tango-replacement-battery-37v-1500mah-li-ion","title":"SVP Tango Replacement Battery 3.7V 1500mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eSVP Tango \/ Deco Pro — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V 1500mAh Li-ion battery fits the SVP Tango and Deco Pro smartphones. It replaces a degraded or failed original cell and restores normal power delivery to the device. Capacity is 1500mAh (5.55Wh) — use the product data figure, not estimates from third-party listings.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTango and Deco Pro compatibility:\u003c\/strong\u003e\n    Both models share the same battery footprint, voltage rail, and connector pinout. The 65.80 × 43.90 × 5.10mm cell fits the bay without modification, and the BMS communicates correctly with the charge IC on both handsets.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge, standby, and load discharge on the Tango platform. The BMS held within spec at both charge cutoff and low-voltage protection, and no false over-temperature flags triggered during the test sequence.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one full discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated reference.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the Tango 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 curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage against old data and reports a percentage that drifts from reality. One full discharge-charge cycle — down to auto-off, then a full charge — forces the coulomb counter to recalibrate against the new cell and correct the readout.\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 cell voltage drops below what the modem or display load demands, even though the fuel gauge still shows capacity remaining. A fresh cell with an uncalibrated fuel gauge will hit a voltage cliff faster than the OS expects under peak load. The BMS cuts output to protect the cell before the displayed percentage reaches zero. Run one full discharge cycle to the automatic shutdown point, then charge uninterrupted to 100% — this realigns the low-voltage threshold estimate and eliminates the premature cutoff.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409491394650,"sku":"BWCS-NK4LSL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409491427418,"sku":"BWCS-NK4LSL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409491460186,"sku":"BWCS-NK4LSL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NK4LSL-1.webp?v=1778611065","url":"https:\/\/batteryweb.com\/products\/svp-tango-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}