{"product_id":"att-maven-2-replacement-battery-37v-1800mah-li-ion","title":"AT\u0026T Maven 2 Z831 Replacement Battery 3.7V 1800mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eAT\u0026amp;T Maven 2 \/ Z831 — 3.7V Li-ion Replacement Battery\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.7V, 1800mAh Li-ion battery replaces the original cell in the AT\u0026amp;T Maven 2 and Z831 smartphones. It restores power for calls, messaging, and everyday app use. Capacity is 6.66Wh and dimensions are 72.74 × 53.41 × 4.67mm — measure your original before ordering.\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 devices share the same battery bay dimensions, voltage rail, and connector pinout, which is why one cell covers both model numbers. The BMS handshake protocol is identical across the two variants.\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 a Maven 2 unit, confirmed the BMS accepted the new cell without a protection trip, and verified the charge IC reached full termination voltage at 4.2V.\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-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before it starts reporting accurate percentages 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 Maven 2 after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe Maven 2 fuel gauge IC stores a discharge model calibrated to the original cell's impedance curve. A new cell has different internal resistance, so the IC underestimates how fast voltage will drop under modem or screen load. When the phone demands current for a voice call or display wake, cell voltage sags below the protection threshold before the reported percentage hits zero. The BMS then cuts output to protect the cell, and the phone shuts off — even though the percentage still showed 20% or higher. One full discharge cycle down to automatic shutdown, followed by an uninterrupted charge to 100%, forces the coulomb counter to reset against the new cell's actual curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003ePhone shows wrong battery percentage after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe fuel gauge IC on the Maven 2 uses a stored charge curve built from hundreds of cycles on the original cell. Drop in a new cell and that stored curve no longer matches actual cell chemistry, so percentage readings drift — often reading 80% when the cell is nearly flat, or jumping erratically between values. This is not a fault with the replacement cell. Run one complete cycle: discharge the phone until it powers off on its own, then charge without interruption to 100% with the screen off. After that single cycle the IC recalibrates and percentage reporting stabilises.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43404321620058,"sku":"BWCS-ZTN986SL-1","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43404321652826,"sku":"BWCS-ZTN986SL-2","price":33.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43404321685594,"sku":"BWCS-ZTN986SL-3","price":37.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-ZTN986SL-1.webp?v=1778773940","url":"https:\/\/batteryweb.com\/products\/att-maven-2-replacement-battery-37v-1800mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}