Grade Key Features Best Use Grade A LiFePO4 Cells Highest quality, consistent capacity, low resistance, long cycle life Electric vehicles, solar storage, medical devices Grade B LiFePO4 Cells Good but less consistent, moderate resistance, shorter lifespan Backup power, e-bikes, consumer electronics Grade C LiFePO4 Cells Lowest performance, high variability, shorter cycle life Toys, testing, low-cost gadgets