1. Quartz needs very little power
A quartz wall clock usually runs on one AA cell. It uses so little current that an alkaline cell can last a year or more.
2. Check the battery first
If the clock has stopped, fit a fresh battery of the right size. Make sure it sits firmly and the contacts are clean.
3. Stuck hands
If the hands touch each other or the glass, they can jam the movement. Reposition them gently, following the manual, and don’t force them round.
4. Leaking batteries
An old battery left in a clock can leak and corrode the movement. Remove old batteries, clean the compartment and then fit a new cell.