Designed for 36v batteries, this reliable charger features a 5.5mm outer 2.1mm inner plug, 2 amp output, and a 42v rating. It's also compatible with reid scooters and e bikes with a single pin port. ·        compatible with zone, navigate, and flow compass e bikes·        suitable for 36v reid scooters and e bikes with a single pin port battery·        5.5mm outer 2.1mm inner plug·        output 2 amp·        42v suitable for 36v batteries onlysafety notice using an unofficial battery charger could damage to your battery and will void your warranty. Only use the genuine battery charger.