{"product_id":"att-maven-2-replacement-battery-38v-2300mah-li-ion","title":"AT\u0026T Maven 2 Z831 Replacement Battery 3.8V 2300mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T Maven 2 (Z831) — 3.8V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 3.8V, 2300mAh Li-ion replacement battery for the AT\u0026amp;T Maven 2 (model Z831) Android smartphone. It fits the battery bay directly and restores power after the original cell degrades. Capacity figure comes from the product data sheet: 2300mAh \/ 8.74Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaven 2 and Z831 compatibility:\u003c\/strong\u003e\n    Both names refer to the same hardware — AT\u0026amp;T's retail branding versus ZTE's model number for the same board. The battery connector, BMS handshake voltage, and bay dimensions (72.90 × 53.60 × 4.70mm) are identical across both designations.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We ran this cell through charge and discharge cycles on the Z831 board. The BMS accepted the charge IC handshake without fault flags, and the protection circuit tripped correctly at low-voltage cutoff — no runaway, no thermal anomaly.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first use:\u003c\/strong\u003e\n    After installing a new cell, disable fast charging for the first full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated measurement baseline.\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 Maven 2 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Maven 2 fuel gauge IC uses a discharge curve stored from the previous cell. A new cell with a slightly different internal resistance profile hits a voltage cliff under modem or display load — the board reads it as a valid 25% state of charge, then collapses when current demand spikes. The fuel gauge IC has not yet seen a full cycle on the new cell, so it cannot predict that cliff accurately. One complete discharge down to auto-shutoff, followed by a full charge to 100%, resets the coulomb counter and eliminates most of these early shutdowns.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB charging not initialising on the first cycle after battery replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eWhen the replacement cell arrives at a low storage voltage — sometimes below 3.4V — the Maven 2 charge controller enters trickle-charge mode and does not negotiate the full USB current profile. The phone may show no charging animation for the first 10–15 minutes. Leave the cable connected without interruption; once the cell climbs above approximately 3.5V, the charge IC re-enters normal CC\/CV mode and the charging indicator appears. Do not unplug and replug repeatedly — that resets the trickle-charge timer each time.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404262801498,"sku":"BWCS-ZTN986XL-1","price":24.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404262834266,"sku":"BWCS-ZTN986XL-2","price":27.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404262867034,"sku":"BWCS-ZTN986XL-3","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTN986XL-1.webp?v=1778773896","url":"https:\/\/batteryweb.com\/products\/att-maven-2-replacement-battery-38v-2300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}