{"product_id":"apple-a3082-replacement-battery-38v-4650mah-li-polymer","title":"Apple iPhone 15 Pro Max A3082 Replacement Battery 3.8V 4650mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eApple iPhone 15 Pro Max — 3.8V Li-Polymer Replacement Battery (NA247)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.8V, 4650mAh (17.67Wh) Li-Polymer cell replaces the original battery in the iPhone 15 Pro Max. It fits models A3082, A3289, A3290, and A3291. Install it when your original cell has degraded below usable battery health, or when the phone shuts down unexpectedly under load.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eiPhone 15 Pro Max model variants:\u003c\/strong\u003e\n    The A3082, A3289, A3290, and A3291 model numbers reflect regional hardware variants of the same iPhone 15 Pro Max chassis. They share the same battery bay dimensions, connector pinout, and BMS handshake protocol — this cell fits all of them.\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 iPhone 15 Pro Max platform. The BMS accepted the cell without rejection flags, charge current stepped correctly through trickle, CC, and CV phases, and the coulomb counter initialised on the first full cycle.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle fuel gauge reset:\u003c\/strong\u003e\n    On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard speed. This lets the fuel gauge IC map the new cell's discharge curve before iOS locks in its capacity estimate — skipping this step is the main cause of erratic percentage readings post-swap.\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 iPhone 15 Pro Max after a battery swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe iPhone 15 Pro Max pulls hard current spikes from the cell during 5G modem bursts and ProMotion display peaks. If the fuel gauge IC hasn't completed a full calibration cycle, iOS's voltage model is still mapped to the old cell's internal resistance curve. The new cell hits a voltage cliff the software didn't predict, and the phone shuts down to protect the SoC — even though charge remains. Run one full discharge to approximately 1–2% followed by a full charge at standard wattage. After that cycle, iOS recalibrates and the shutdowns stop.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charging not engaging on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eAfter a cell swap, the charge IC on the iPhone 15 Pro Max starts the new cell in trickle mode regardless of what the charger offers. The BMS needs to confirm cell voltage is above the fast-charge entry threshold — typically 3.0V — before it signals the USB-PD controller to step up wattage. If the replacement cell shipped at low state of charge, this trickle phase can last longer than expected. Plug in, leave it connected, and fast charging will engage automatically once the cell clears the threshold; no reset or adapter change is needed.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391769051226,"sku":"BWCS-IPH163SL-1","price":406.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391769083994,"sku":"BWCS-IPH163SL-2","price":486.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391769116762,"sku":"BWCS-IPH163SL-3","price":546.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-IPH163SL_1.webp?v=1779141870","url":"https:\/\/batteryweb.com\/products\/apple-a3082-replacement-battery-38v-4650mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}