Low voltage has these main possibilities
① Power virtual connection, electric door lock, battery connection, power switch are possible, there is an individual battery is broken, pull down the whole set of battery voltage, does not rule out the possibility that you forget to charge
② The instrument is faulty, and the display is inaccurate
③ The battery is aging, can not save much electricity, need to replace the whole group
First charge to see, if the torsion bar power crazy fall in the end, check whether the electric door lock is virtual, check which line of the battery is loose, see whether the air switch is burnt
This is a very simple problem, if you can't solve it, then take it to the repair shop