Electric Scooter Repair Help > Battery Pack Load Testing Guide
Battery Pack Load Test Procedure
Open this load test procedure as a printable PDF file .
Tool Required: Multimeter
A multimeter can be purchased from us for around $13.00 including shipping, or at any auto parts or hardware store for between $15.00 to $20.00.
Load Test Procedure:
1 - Charge battery pack for 6 to 8 hours if it has not been recharged in last 30 days.
2 - Place front wheel of scooter or bike against a wall so the vehicle can not move.
3 - Set the multimeter function selector to DC Volts.
4 - With scooter's power off touch the multimeter probes to the battery pack
terminals and read the Voltage.
5 - Have someone sit on the scooter or bike so the wheel does not spin. Turn
the power on and then fully engage the throttle for a second or two and read
The battery pack's Voltage with the scooter's power off should be a few Volts higher than
the scooter's Voltage rating (24V, 36V, 48V, etc.). If battery pack's Voltage with
the scooter off is under scooter's rated Voltage then it has failed the load test
and needs to be replaced.
The battery pack Voltage with the power on and throttle fully engaged should
not drop more than 1 to 2 Volts and should not drop to under scooter's rated
Voltage. If the battery pack Voltage drops under scooter's rated Voltage during
the load test then the battery
pack has failed the load test and needs to be replaced.
Alternative Testing Method:
1 - Call a local auto part stores and ask if they can load test small sealed
lead acid batteries. (All auto parts store can do this but some do not want to.)
2 - If an auto parts store agrees to test batteries take a photo or draw a picture
of the wiring harness that is attached to the batteries. Remove the wiring harness from
batteries and bring individual batteries to auto parts store for testing.
3 - Use the wiring harness photo or drawing as
a guide that shows how to reattach the wiring harness to the batteries when reinstalling them.