Anytime you have questions about our battery packs or any other item, feel free to reach out to our technical support team. When checking the voltage, always follow live electrical circuit precautions, even when discharged. You will need proper fine-point testing leads that are isolated to avoid contact with each other.
Recall that measurement is made by contact and there is no need to apply pressure on the items. Pushing or applying pressure could cause damage to the parts. Use a properly tested multimeter set to the DC volts measurement setting. Insert the leads into both sockets, and you will obtain your measurement. If your battery has a power button, press it after inserting the leads to generate the measurement.
The 52V pack will typically measure a range from 58VDC to 42VDC
The 48V pack will produce a measurement in a range from 54VDC to 40VDC
Note: Measurements are approximate as there are many variables to take into account regarding Lithium-Ion Batteries. Se here for more info