ElectricScooterParts.com Support Center

Does the speed of the scooter slow down before it stops running? Or does the speed remain the same and then the scooter stops running all of a sudden?

The battery level indicator lights on the throttle or instrument panel are a basic Voltmeter and if they go off when the throttle is engaged that indicates that the battery pack is dropping too much Voltage under load. Everything that you described points towards the battery pack being faulty.

A small percent of new batteries have factory defects and sometimes load tests results are not correct due to human error so even though the batteries are new and they have been load tested the scooter's built in Voltmeter is telling a different story.

Battery level indicator lights are reliable and not prone to giving inaccurate readings so you could trust them, or you could verify their reading by checking the Voltage of the battery pack when the throttle is engaged to see if its reading matches the indicator lights.

The Zappy 3 Pro scooter's 36 Volt battery pack should have around 39 to 41 Volts when fully charged and the power switch is off, and when the power switch is on and the throttle is fully engaged the Voltage should only drop around 1/2 to 1 Volt for a new battery pack, and to not less than 36 Volts for a good used battery pack.

Please let us know how it goes.

The load test should be performed with the wheel on the ground and the scooter being held still.

All three of those batteries have poor load test results so maybe they are from an old or faulty batch of batteries. I would expect for new batteries to be at around 13.5 Volts with no load and 12 Volts or higher under load.