{"product_id":"att-a767-propel-replacement-battery-37v-850mah-li-ion","title":"AT\u0026T A767 Propel Compatible Battery 3.7V 850mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T A767 Propel — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 850mAh Li-ion cell replaces the original battery in the AT\u0026amp;T A767 Propel slider phone. It restores power to calling, messaging, and on-device apps when the factory cell has degraded or stopped holding a charge. Dimensions are 47.23 × 36.31 × 5.40mm — same footprint as the OEM cell.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA767 Propel fit:\u003c\/strong\u003e\n    The Propel uses a dedicated battery bay sized for this exact cell form factor. The connector orientation and BMS contact points match the original, so the phone's charge IC picks up the new cell without adapter modifications.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran charge-discharge cycles on this cell and monitored the BMS handshake with the Propel's charge circuit. The protection circuit trips correctly at low-voltage cutoff and resets cleanly on reconnect.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    On first install, disable any fast-charge accessory and run one complete discharge-charge cycle at standard current. This gives the phone's fuel gauge IC a full sweep of the new cell's discharge curve before the percentage readout can be trusted.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the A767 Propel reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Propel's fuel gauge IC stores a discharge curve from the old cell. When a new cell goes in, the IC is still referencing that old curve, so the percentage on screen doesn't track real charge state. The fix is one full discharge to auto-off, then a full charge without interruption. After that single cycle, the IC has a fresh baseline and the percentage readout stabilises.\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 sharply under modem or screen load — a voltage cliff the uncalibrated fuel gauge doesn't predict. The phone's protection circuit cuts power before the display percentage hits zero. It's not a faulty battery; it's the fuel gauge acting on stale data. Run one full cycle as described above and check that resting cell voltage reads above 3.6V after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43409448468570,"sku":"BWCS-SMF480SL-1","price":22.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43409448501338,"sku":"BWCS-SMF480SL-2","price":25.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43409448534106,"sku":"BWCS-SMF480SL-3","price":27.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-SMF480SL-1.webp?v=1779579708","url":"https:\/\/batteryweb.com\/products\/att-a767-propel-replacement-battery-37v-850mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}