{"product_id":"att-575-replacement-battery-37v-980mah-li-ion","title":"AT\u0026T 575 Replacement Battery 3.7V 980mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T 575 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V Li-ion cell rated at 980mAh (3.63Wh), built to fit the AT\u0026amp;T 575 smartphone. It replaces the original cell when capacity has dropped to the point where the phone no longer holds a usable charge. Dimensions are 70.40 x 46.80 x 5.40mm — verify these against your existing cell before ordering.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAT\u0026amp;T 575 fit:\u003c\/strong\u003e\n    The 575 uses a fixed connector pinout tied to this specific cell footprint. Voltage rail and physical dimensions must match exactly — this cell meets both requirements for the 575 platform.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge passes, confirming the BMS holds the 4.2V upper cutoff and trips correctly at the low-voltage floor without false shutdowns mid-cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first installation, run one complete discharge to shutdown followed by a full uninterrupted charge. This gives the phone's fuel gauge IC a clean reference curve against the new cell before it starts reporting percentage data to the OS.\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 AT\u0026amp;T 575 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe AT\u0026amp;T 575 reads remaining charge through a fuel gauge IC that was calibrated to the original cell's discharge curve. A new cell has a different internal resistance profile, so the IC misjudges how much voltage is left under load. When the modem fires up for a call or the screen peaks in brightness, the new cell's voltage dips below what the IC expects at that charge level. The phone interprets this as a critical low-voltage event and shuts down — even though the cell still has charge. One full discharge-charge cycle recalibrates the coulomb counter and eliminates most of these early cutoffs.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery percentage jumping erratically after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eErratic percentage jumps — say, 45% dropping to 12% in seconds — point to the fuel gauge IC working from stale calibration data stored during the life of the old cell. The IC uses a coulomb counter that tracks charge in and out, but the baseline it anchors to no longer matches the new cell's chemistry state. This is not a fault in the replacement cell. Charge the phone to 100%, let it discharge fully until it shuts itself off, then charge back to 100% without interruption — after that cycle, the reported percentage should stabilise.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405258686554,"sku":"BWCS-LCU575SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405258719322,"sku":"BWCS-LCU575SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405258752090,"sku":"BWCS-LCU575SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-LCU575SL-1.webp?v=1779370368","url":"https:\/\/batteryweb.com\/products\/att-575-replacement-battery-37v-980mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}