Check the voltage before using the machine. When the voltage is lower than 24V (T150 is 36V), it cannot be used and must be charged; each time you use it, do not use up the battery completely, and you must charge it when there are only 2 batteries left, otherwise, it will be easy The battery life is shortened, and it will be scrapped if it is serious. When the machine is not used for a long time, in order to prevent the battery from being over-discharged, the battery should be replenished regularly (usually 2 months).