Tool battery with voltage and electric quantity display

The application provides a tool battery with voltage and electric quantity display, which comprises a battery pack and a voltage display; wherein the battery pack consists of 2N battery cells, every N battery cells are connected in series and then connected in parallel, wherein the N is a natural number; the tool battery pack further comprises a protection board, and the protection board is installed next to the battery, and is connected with an external charger for transmitting data; the voltage display is respectively connected to the positive electrode and the negative pole of the voltage display, and displays the real time voltage of the battery pack. The tool battery according to the invention has the beneficial effects of displaying the current battery voltage and the remaining electric quantity exactly, charging under a safe voltage, and prolonging the service life of the battery.