When evaluating Electric Fat Bikes, prioritize the Motor Power (typically 500W to 1000W) and Battery Capacity (measured in Ah/Wh). Ensure the battery uses Grade A Lithium-ion cells (e.g., Samsung, LG, or Panasonic) for longevity. For the frame, 6061 Aluminum Alloy is the industry standard for balancing weight and durability. Additionally, verify the Tire Width (usually 4.0 inches or wider) and the Braking System, where Hydraulic Disc Brakes are preferred over mechanical ones for the safety of heavy off-road e-bikes.