Short Answer: Building a 48V LiFePO4 battery pack with duty-free A-grade cells involves selecting high-capacity 3.2V cells (e.g., 340Ah or 280Ah), arranging them in series/parallel configurations, and integrating a BMS for safety. Duty-free cells reduce… How to Build a 48V LiFePO4 Battery Pack with Duty-Free A-Grade Cells?