Sempervee, Where (what point) are you measuring the battery at ... at the charging port or at the actual output connection (where it feeds your controller)? The charging port is usually managed by the internal BMS and you can sometimes see different voltages at this point that don't always reflect the actual state of charge of the combined cells in the battery unless the BMS believes the battery is plugged into a charger. The output connection will always represent the actual state of charge when the battery is ON, but you have to be very careful about working with that connection, as the full amperage potential is available at that point (so any short across that connector will blow internal fuses or possibly burn/vaporize a probe)..

If your batteries have an on/off switch, turn it on. If your batteries don't have a separate on/off switch you may not be able to measure them without being installed on the bike or charger (without going through other possibly invasive steps). If you don't have an on/off switch on the batteries you may still be able to find a connection point on the bike that will allow you to correctly measure the state of charge voltage of the battery.

For example I have a 52v battery (it's not bike specific, just one of the standard Hailong case downtube batteries). When fully charged if I measure the voltage at the charging port it reads about 32v when the battery is switched OFF, and the correct 58v when it is switched ON.