{"product_id":"att-maestro-replacement-battery-38v-1950mah-li-ion","title":"AT\u0026T Maestro LT20H445170B Replacement Battery 3.8V 1950mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T Maestro \/ U202AA — 3.8V Li-ion Replacement Battery (LT20H445170B)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 1950mAh Li-ion replacement battery for the AT\u0026amp;T Maestro (U202AA) smartphone. It replaces OEM part numbers LT20H445170B and LT20H445170W. If your Maestro is shutting down unexpectedly, not holding a charge, or won't power on at all, this cell is the direct swap.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaestro \/ U202AA fit:\u003c\/strong\u003e\n    Both the Maestro and U202AA designations refer to the same hardware platform and share an identical battery connector, voltage rail, and BMS handshake. One cell covers both variants without modification.\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 and discharge cycles on the Maestro platform. The BMS accepted the cell on first connection, charge termination triggered correctly at 4.35V, and low-voltage cutoff engaged as expected without requiring a reset.\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 and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC pushes higher 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\"\u003eSudden shutdown at 20–30% on the Maestro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThis is a voltage cliff issue, not a capacity problem. Under modem or display load, the new cell briefly sags below the shutdown threshold even though the fuel gauge still reads 20–30%. The fuel gauge IC hasn't yet mapped the new cell's discharge curve, so it misjudges the remaining usable voltage. One full discharge-charge cycle at standard rate gives the coulomb counter enough data to correct its estimate and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eDevice not powering on after the replacement cell sat in storage\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eLi-ion cells self-discharge in storage, and if the cell dropped below 2.5V the BMS enters a lockout state to prevent damage. The phone will show no response — no charging indicator, no boot. Connect to a wall charger rated at least 5V\/1A and leave it for 20–30 minutes without pressing the power button. The charge IC will trickle current into the cell until voltage recovers above the BMS re-enable threshold, after which normal charging resumes.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391938756698,"sku":"BWCS-AMU202SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391938789466,"sku":"BWCS-AMU202SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391938822234,"sku":"BWCS-AMU202SL-3","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-AMU202SL-1.webp?v=1779142677","url":"https:\/\/batteryweb.com\/products\/att-maestro-replacement-battery-38v-1950mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}