1. Firstly, the voltage should be determined by the battery before the plug-in water meter.
2. Second, look at the battery model.
3. Next, it depends on whether the battery is wired or plugged on the line. If the battery is wired, the positive red wire of the battery should be welded on the circuit board by electric soldering iron. The black wire or other color wires are usually negative electrodes of the battery, and the wires should be welded on the negative electrodes.
4. The plug with the same spacing as the original model, and the position of red and black lines must be the same. Otherwise, the circuit will be short-circuited and damaged.
5. Finally, cut the plug of the old battery, red to red, black to black, and tie the cores together, respectively. Install the battery, brush down the water card, and the solenoid valve opens. Your water can be used.