The battery used by the water meter is a disposable battery, which can only be replaced without electricity and can not be charged.
Water meter battery from the principle of universal charging is not possible. Because the battery in the water meter is an ordinary alkaline battery, not a rechargeable battery. However, if you can not buy a suitable battery for a while, but also want to use it for emergency use, you can also use the charger to temporarily charge, intermittent charging, and stop when the battery is slightly hot. At this time, the measured voltage can also reach more than 3v. It's still gonna work for a while.
Most of the batteries of electronic watches do not need to be charged, to be changed, there are charging, with solar energy, and in recent years, a digital watch (the kind that connects to mobile phones) has a charging port or wireless charging.