How Long Does a Watch Battery Last?

The honest answer is two to three years for most analog quartz watches, and anything from eighteen months to ten years once you include every kind of battery powered watch. The spread is wide because the battery is only half the equation. The other half is how much work the movement asks of it, and that varies a great deal between a slim three hand dress watch and a busy chronograph with a backlight.

Below is what decides it, how to read the warning signs, and what to do when the time comes.

Typical battery life by type of watch

These are the ranges watchmakers and movement makers usually quote. Your own watch may fall outside them, and the instruction sheet, where one exists, is the best guide.

General ranges, not figures for any specific model.

One detail surprises new owners: the battery in a new watch may already be part way through its life. Many watches are fitted with a battery at the factory, sometimes as a test cell, and then sit in a warehouse and a shop before they reach you. A first battery that lasts a year is not unusual and does not mean anything is wrong.

What drains a watch battery faster?

• Complications in use. Running a quartz chronograph's stopwatch for hours at a time can cut battery life sharply. We explain the stopwatch in what a chronograph is.
• Light and sound. On digital watches, every press of the backlight and every alarm costs a little. Daily alarms add up over years.
• Cold. Battery chemistry slows down at low temperatures. A watch left in a cold car will not be harmed, but its cell works harder.
• Large or heavy hands. Big, long hands need more torque to move than slim ones, which is one reason oversized quartz watches can go through cells faster.
• Age of the cell before fitting. A battery from old stock may have lost some charge on the shelf.

What does not matter much is whether you wear the watch. A quartz movement runs all the time, on the wrist or in a drawer, so an unworn watch uses its battery at the same rate.

How does a watch tell you the battery is low?

Many analog quartz movements have an end of life indicator: when the voltage drops, the seconds hand starts jumping two or four seconds at a time instead of one. The watch is still keeping time, but you have days or weeks, not months. Other movements simply start losing time, or the hands stop altogether.

On digital watches the display usually fades or flickers, and the light dims or stops working before the timekeeping does. Solar powered watches often show a charge indicator or switch the seconds hand to a two second step when they need light.

Do not leave a dead battery inside

A flat battery is not harmless. Over months, an exhausted cell can leak, and the residue is corrosive. It can damage the contacts and circuit of the movement, and a watch that would have needed a new battery ends up needing a new movement. If a quartz watch stops and you are not going to replace the battery soon, take the old one out. The same applies to watches you put away for a long time; our guide to storing watches covers it.

Replacing a watch battery

A battery change is quick at a watch shop, kiosk or jeweler, and the price depends mostly on the shop and on whether the case is resealed and checked afterward. A watch with a screwed caseback, a sports watch you swim with or a chronograph is worth taking to a proper watch shop, because opening the case disturbs the rubber gasket that keeps out moisture and dust, and a good shop replaces or greases it and checks the seal.

If you change one yourself, a few points help:

1. Read the code on the old cell and buy the exact replacement. Watch cells are usually silver oxide, which hold a steady voltage to the end; alkaline cells of the same size are cheaper but less stable.
2. Use plastic tweezers, since metal ones can short the cell or scratch the movement.
3. Do not touch the new cell with your fingers; skin oil on the contacts can affect the connection.
4. Check the gasket is seated evenly before you close the back.
5. Reset the hands on a chronograph if they no longer return to zero; the instructions describe how.

Avoid forcing a caseback with a kitchen knife. The scratches on the case and the cuts on your hand are the two most common results; a cheap caseback knife does the job properly.

Watches that avoid the question

If changing batteries annoys you, three kinds of watch reduce or remove it. Solar quartz watches, such as Citizen's Eco Drive range, recharge a cell from light and can run for many years with occasional exposure. Kinetic and similar movements generate power from wrist motion. And mechanical watches, automatic or hand wound, have no battery at all, though they need servicing every several years instead. The trade offs are covered in quartz vs automatic, and the habits that shorten any watch's life are in eleven watch care mistakes.

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