A system securing the LiPo battery set from an excessive discharge. The device is connected to the balancer's plug. The device signals us the excessive discharge with the help of a sound (inbuilt buzzer). The use of the Firefox LiPo alarm guaranties the increased safety of use of the battery and significantly expands its lifespan. Additionally, the device is equipped with a display which informs us about the current voltage value on each cell and about the total voltage of the battery pack. It is needed to remember to detach the alarm from the battery when it is not used in order to prevent the battery from being used.