Reviewed by the Fine Watch Guide team · October 2026
A dead quartz watch and a dead mechanical watch look identical on the wrist, and they need very different things. One is often a five-minute battery swap. The other almost never is. Knowing which you own, and what the warning signs mean, saves you from paying for an overhaul you don't need or putting off one you do.
Quartz watches run on a battery, so a stopped quartz watch often needs only a new cell and a gasket check. Mechanical watches have no battery at all; when one stops, runs badly or fogs up, it needs a service from a watchmaker, which means dismantling, cleaning, relubricating and regulating the movement.
Watch the seconds hand. A quartz movement steps it forward once a second in a distinct tick, while most mechanical watches sweep it in a smooth arc made up of many small beats per second. The dial sometimes helps too: words like Automatic, Perpetual or Chronometer usually point to mechanical, and Quartz is printed on plenty of battery watches.
There are exceptions worth knowing. Grand Seiko's Spring Drive sweeps smoothly but uses a quartz regulator, and some high-end quartz watches are built to the same standard as mechanical pieces. If you're unsure, any watchmaker can tell you in seconds by looking at the caseback or the movement.
Knowing which you have changes what you ask for at the counter. A quartz owner can reasonably ask for a battery and a seal check. A mechanical owner asking for a battery will either get a puzzled look or, at a careless shop, a casual opening of the case that does more harm than good.
The cell is the cheap part. What separates a professional battery change from a kiosk job is everything that happens after the caseback comes off. A careful watchmaker cleans the contacts, checks the movement draws the right current, replaces or lubricates the caseback gasket and closes the case with the correct tool so the threads and gasket seat properly.
Then the watch should go through a pressure test. Opening a case disturbs its seal, and a dive watch that's had its battery swapped without a test can let water in on the first swim. If a shop can't test water resistance, it shouldn't be opening a watch you plan to get wet.
Expect a careful battery change on a luxury quartz watch to cost more than a kiosk swap, mostly because of the gasket, the test and the time it takes. That premium is cheap compared with replacing a movement that's rusted after a failed seal.
A new battery that dies within months usually means the movement is drawing too much current, often because old oils have thickened or a part is wearing. That's a service, not another battery. The same goes for a quartz watch whose hands stop and start, or one that came back from a leak with corrosion on the contacts.
Old batteries can also leak. A cell left in a drawer watch for years can damage the movement, and once that happens the repair is a movement service or replacement. If you put a quartz watch away for a long time, have the battery taken out.
A mechanical watch tells you when it's tired. Timekeeping drifts by minutes a day where it used to be within seconds, the power reserve shortens so it stops overnight, or the winding feels gritty. On an automatic, a grinding or rattling rotor is a clear signal; on any watch, condensation under the crystal means water got in, and that needs a watchmaker quickly before rust sets in.
Even a watch running well benefits from a service on schedule, because lubricants break down over the years whether or not you notice. Many brands publish guidance; Rolex, for one, suggests roughly a decade for current models, while older calibers often want attention sooner.
Magnetism is a common false alarm worth ruling out first. A watch that suddenly gains minutes a day after sitting near a laptop, speaker or phone case magnet may simply be magnetized, and a watchmaker can demagnetize it in seconds. If the rate settles afterward, you may not need a full service yet.
For a battery on an inexpensive quartz watch, any competent repair counter will do. For a luxury quartz piece, or anything with a dive rating, go to a watchmaker with a pressure tester and the right caseback tools, because a scratched caseback or a failed seal costs more than the battery ever will.
A mechanical service belongs with a watchmaker who works on your brand regularly and can source its parts. Ask what the service includes, whether they test water resistance, and how they'll handle original parts on an older watch.
A battery change on a simple quartz watch is usually quick and inexpensive, and many shops do it while you wait. On a luxury quartz watch, allow for a gasket, a pressure test and sometimes a day or two if the watchmaker is busy. Either way, it's a small job measured in minutes of bench time.
A full mechanical service is a different scale of work. The watch is dismantled, cleaned, rebuilt and regulated, then tested over several days to confirm it holds its rate. Most independents quote a few weeks, factory service can take longer, and the cost sits in the hundreds rather than the tens, rising with complications and any parts the movement needs.
If a shop quotes a mechanical service as a quick same-day job, treat that as a warning. Done properly, the cleaning, reassembly and testing alone take longer than a day.
26 verified watch repair specialists in the cities we cover.
No. An automatic winds itself from the motion of your wrist through a rotor. If it has stopped, wear it or wind it; if it won't run properly, it needs a service, not a battery.
Commonly a couple of years or more, depending on the movement and features such as lights or chronographs. A new battery that dies within months points to a movement problem.
It can. Opening the case disturbs the seal, so the gasket should be checked or replaced and the watch pressure tested afterwards, especially if you swim with it.
It's possible on simple watches, but it's easy to scratch the caseback, damage the movement or break the seal. On a valuable or water-resistant watch, have a watchmaker do it.
Dismantling the movement, cleaning every part, replacing worn components and gaskets, relubricating, reassembling, regulating and pressure testing the case.