How to test ebike battery?

To test an eBike battery, you will need to use a voltmeter or multimeter to measure its voltage. First, turn off the eBike and disconnect the battery. Set your voltmeter or multimeter to DC voltage and make sure its range is set higher than the battery's voltage. Connect the voltmeter or multimeter to the battery's positive and negative terminals, and read the voltage. A fully charged battery should read close to its rated voltage. If the voltage is significantly lower, the battery may need to be charged or replaced. It's also a good idea to have a professional eBike technician test the battery if you are unsure about its condition.