Ordinary water meters do not need to install batteries. Those with display screens need to install batteries. Those who do not need manual meter reading may also need batteries. If the water meter is an ordinary water meter, that is, a rotor-type water meter, there is no need to install batteries. This water meter is mainly composed of a casing, an impeller measuring mechanism, a deceleration mechanism, and an indicator meter. It has the characteristics of simple structure. If the water meter is an IC card prepaid water meter, a battery needs to be installed. Since its data transmission and transaction settlement are carried out through the IC card, it is possible to realize the change from the staff's door-to-door meter reading to the user's own payment at the business office. IC card transactions The system also has the characteristics of convenient transaction and accurate calculation. It can use the bank for settlement.