Replacement 4422mAh Battery Compatible with iPhone 15 Pro Max A3121

This premium battery for iPhone 15 Pro Max A3121 is an OEM-grade replacement lithium-ion power cell engineered to restore maximum battery health, standby time, and peak device performance. Whether your device is experiencing rapid battery drain, swelling, random shutdowns, or service warnings in settings, this battery for iPhone 15 Pro Max A3121 delivers full 4422mAh capacity with stable 3.87V output. Manufactured with high-density pure cobalt cells and an integrated protection board, each battery undergoes rigorous cycle-life and safety bench tests before dispatch. — ### Technical Specifications | Feature | Specification | | :— | :— | | **Compatible Device** | Apple iPhone 15 Pro Max | | **Model Compatibility** | A3121 (Also compatible with A2849, A3105, A3106, A3108) | | **Battery Chemistry** | Rechargeable Lithium-ion (Pure Cobalt) | | **Rated Capacity** | 4422mAh / 17.109Wh | | **Nominal Voltage** | 3.87V (Charge Voltage Limit: 4.48V) | | **Cycle Life** | 500+ Cycles (maintains ≥80% original capacity) | | **Condition** | Brand New 0-Cycle, Factory Tested Grade A | — ### Compatibility & Fitment Guidelines This replacement battery for iPhone 15 Pro Max A3121 is specifically engineered for the 6.7-inch flagship model: * **Supported Models:** iPhone 15 Pro Max (Models A3121, A2849, A3105, A3106, A3108). * **Size Restriction:** Strictly fits the 15 Pro Max casing. It does **NOT** fit the smaller 6.1-inch iPhone 15 Pro, iPhone 15, or iPhone 15 Plus. * **System Prompt Notice:** On modern iOS versions, replacing the battery will display an “Unknown Part” / non-genuine notification unless the original battery BMS flex is transplanted and reprogrammed. This notification does not affect normal charging, safety, or battery lifespan. — ### Multi-Level Safety & Reliability * **Intelligent BMS Circuit:** Built-in IC chip safeguards against over-charge, over-discharge, short-circuit, and thermal runaway. * **Zero-Cycle Fresh Cells:** Brand new cells ensure pristine health metrics and maximum service longevity. * **Precision Flex Connector:** Gold-plated connection tabs ensure seamless contact and zero intermittent power loss. — ### Non-Affiliation & Legal Disclaimer *This is an aftermarket replacement part manufactured to OEM specifications. “Apple” and “iPhone” are registered trademarks of Apple Inc. References to Apple devices and model numbers are used strictly for technical compatibility identification under nominative fair use. CTOPU is an independent supplier of replacement electronics and is not affiliated with or endorsed by Apple Inc.*