1, the movement is damaged, the clock movement has the possibility of abnormal discharge, you can check the battery power after walking slowly, if it has been used up, consider the movement problem needs to replace the clock movement.
Because the movement is a high-precision and low-power product, it is only suitable for the use of ordinary carbon batteries, high-energy batteries and rechargeable batteries will impact the movement and cause internal damage, and the service life of the brand movement can reach 30 years under normal circumstances.
2, too much grease, caused by poor lubrication.
3, crystal aging, wall clock inside the use of a crystal oscillator as a reference frequency, the accuracy depends on the frequency of the crystal.
The reason for slow walking is generally caused by wear between the gears, and there is a lack of battery power will also make the wall clock slow, which is generally not perceptible. If it's slow, it's time to change the battery or the wall clock
The electronic clock is running slowly, the battery should be replaced!