{"product_id":"letv-leeco-le-2-replacement-battery-383v-3000mah-li-polymer","title":"LeTV LeEco Le 2 Replacement Battery LTF21A 3.83V 3000mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eLeTV LeEco Le 2 \/ X620 \/ Le 2 Pro — 3.83V Li-Polymer Replacement Battery (LTF21A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3000mAh (11.49Wh) lithium-polymer cell rated at 3.83V, built to fit the LeEco Le 2, Le 2 Pro, X620, and X520 series smartphones. It replaces OEM part number LTF21A. Fit these models when the original cell no longer holds voltage under screen or modem load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLe 2 \/ Le 2 Pro \/ X620 \/ X520 platform fit:\u003c\/strong\u003e\n    These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 3.83V nominal voltage rail matches the charge IC on all listed variants — swapping between them does not require any firmware changes.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through full charge-discharge cycles on a Le 2 unit. The BMS accepted the cell without error flags, charge termination triggered correctly at full capacity, and voltage held stable across high-draw screen-on and modem-active states.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installation, disable fast charging and run one complete discharge down to auto-shutoff, then charge to 100% on standard current. This gives the fuel gauge IC one full cycle to map the new cell's discharge curve before fast-charge current is applied to 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 Le 2 reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Le 2 uses a coulomb counter paired with a fuel gauge IC that builds its discharge model from the original cell's impedance and capacity curve. When you install a new cell, that stored model is still calibrated to the old, degraded battery. The gauge reads voltage and current against the wrong reference, so it reports inaccurate percentages — sometimes jumping 10–15% in either direction. One full discharge-charge cycle on standard charging rewrites the reference and corrects 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 shutdown is a voltage cliff event, not a capacity problem. When the modem runs a data burst or the display hits peak brightness, instantaneous current draw spikes and pulls the cell voltage below the BMS cutoff threshold — even though the gauge still shows charge remaining. On a new cell before calibration, the fuel gauge IC does not yet know where that voltage cliff sits for this specific cell's internal resistance. Let the phone discharge naturally to auto-shutoff once, charge fully to 100%, and the BMS will map the cliff correctly. After that first full cycle, shutdowns at 20–30% should stop.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43392091029594,"sku":"BWCS-LTX620SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43392091062362,"sku":"BWCS-LTX620SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43392091095130,"sku":"BWCS-LTX620SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LTX620SL-1.webp?v=1779143685","url":"https:\/\/batteryweb.com\/products\/letv-leeco-le-2-replacement-battery-383v-3000mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}