According to IATA standards, a mobility scooter’s Lithium-Ion battery is limited to 350 W/h. Some airline staff members are unaware of the standard for mobility scooters and will insist that the maximum wattage not exceed 150 W/h, the IATA’s limit for laptop batteries. At this point, you may present them with the battery certification documents you received with ATTO, whose battery has a capacity of 250 W/h.