Battery capacity checking system

The utility model relates to the technical field of battery capacity checking, and discloses a battery capacity checking system which comprises an MCU control center, an activation discharge circuit, a detection circuit, an output load, a communication circuit and a DTU power interface, the activation discharge circuit is connected with a battery to be tested, the MCU control center is electrically connected with the activation discharge circuit, the detection circuit and the output load communication circuit, and the DTU power interface is electrically connected with the activation discharge circuit. The activation discharge circuit, the detection circuit and the output load communication circuit are all connected with the DTU power interface, the communication circuit is connected with an external user side, the capacity checking process of the lead-acid storage battery can be automatically completed in a timing mode, and the efficiency of the capacity checking step of the storage battery is greatly improve