Voltmeter (charger/Battery)
This voltmeter can display the output voltage of your charger and while the battery is being charged as well as the final voltage of your battery. Place the voltmeter between the charger and battery to display the charging voltage from the charger. After the battery is charged unplug the charger, the voltmeter will display the final voltage of the battery. The voltmeter is compatible with charger with 5.5x2.1 mm male DC plug with a 5.5x2.1x14mm male and a 5.5x2.1mm female connectors. If your charging port is 5.5x2.5mm you can add a 5.5x2.1 to 5.5x2.5 adapter (not included). Note some e-scooters will not display voltage of the battery from the charging port but you can still see the voltage of the charger and during the charging process.