{"product_id":"att-avail-replacement-battery-37v-1500mah-li-ion","title":"AT\u0026T Avail Li3715T42P3h415266 Replacement Battery 3.7V 1500mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T Avail \/ N760 Roamer \/ Z990 — 3.7V Li-ion Replacement Battery (Li3715T42P3h415266)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.7V, 1500mAh Li-ion cell that replaces the original battery in the AT\u0026amp;T Avail, N760 Roamer, and Z990 smartphones. It matches the OEM part number Li3715T42P3h415266 and sits within the same 41 × 51 × 6mm envelope as the factory cell. Voltage and capacity are matched to the original spec — no modification needed.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAvail, N760 Roamer, and Z990 fit:\u003c\/strong\u003e\n    All three models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake on each platform accepts this cell without triggering a compatibility fault.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through charge and discharge on the Avail platform. The BMS accepted charge immediately, held the 4.2V full-charge ceiling cleanly, and the protection circuit tripped correctly at low-voltage cutoff — no anomalies logged.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before using the phone heavily. The Avail's fuel gauge IC was calibrated against the old cell's discharge curve — one full cycle rewrites that reference map to the new 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 Avail reports wrong battery percentage after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Avail uses a coulomb counter IC that builds its percentage model from historical discharge data on the previous cell. When a new cell goes in, that stored curve no longer matches the actual charge profile. The phone reads voltage and maps it against the old curve — so 40% displayed might be 55% actual, or vice versa. One full discharge-to-shutdown followed by a complete charge cycle forces the IC to rebuild its reference against the new cell's actual voltage slope.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% remaining on the replacement cell\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the fuel gauge IC hasn't completed recalibration and the cell hits a voltage cliff under modem or display load. Even though the reported percentage looks safe, the cell voltage drops below the BMS cutoff threshold — typically around 3.0V under load — and the phone shuts off. It is not a faulty cell. Charge fully, let the gauge recalibrate over one complete cycle, and the shutdowns stop. If they persist beyond two full cycles, measure resting voltage — it should sit above 3.7V after a full charge.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43405070499930,"sku":"BWCS-ZTN760SL-1","price":21.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43405070532698,"sku":"BWCS-ZTN760SL-2","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43405070565466,"sku":"BWCS-ZTN760SL-3","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTN760SL-1.webp?v=1779369934","url":"https:\/\/batteryweb.com\/products\/att-avail-replacement-battery-37v-1500mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}