The utility model discloses a low voltage warning battery. The low voltage warning battery comprises a shell and a battery set sealed inside the shell. The low voltage warning battery is characterized by comprising a voltage acquisition module which is connected with an output end of the battery set for collecting output voltage of the battery set, a master control module used for receiving the output voltage collected by the voltage acquisition module and for comparing the output voltage with a preset value, and an alarming module which emits low voltage warning signals according to a voltage comparison result of the master control module. The utility model further provides an electric bicycle using the low voltage warning battery. When the power is too low, the electric bicycle using the low voltage warning battery can timely remind users to charge and over discharging of the battery and dropping of battery performance can be avoided. Meanwhile, unnecessary troubles caused by the battery running out abruptly when the users use the bicycle can also be avoided.