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12V 24V 36V 48V 3s1p 4s2p 4s3p Sodium Ion Battery Pack for Motorcycle and Car. High Safety Level: No fire, no explosion, flame retardant, and vibration-resistant. Long Life Cycle: Pulse cycle life exceeds 30,000 times with over 2 years usage life. Fast Starting Efficiency: 0.5s start-up time with high instantaneous discharge rate. Environmentally Friendly: No heavy metal pollution, no radiation, and lighter than lead-acid. High Discharge Rate: Supports fast charge and high instantaneous discharge current. Reliable Cell Quality: Uses famous brand polyan system battery cells for safety.