Quartz Watch Care and Battery Replacement: What You Can Do Yourself
The quartz watch stops, the hands no longer move, or it suddenly runs fast or slow: in most cases, a dead battery is the culprit. The question of whether to change it yourself or go to a watchmaker depends on the watch, not the wearer's courage. This article shows when a DIY battery change makes sense, how it is done correctly, and what maintenance work may be required afterward.
In addition, we cover strap care, as wear and tear on the strap is often more visible than on the movement. Whether leather, stainless steel, or silicone: every material reacts differently to sweat, moisture, and cleaning agents. At the end, there is a checklist of signs that indicate a professional is needed.
How long does a quartz watch battery last and how do you recognize the end?
Most quartz watches use a button cell, usually in the standard size SR626SW, SR920SW, or a similar type. How long it lasts depends on the power consumption of the movement. A simple three-hand watch without a date and without backlighting usually lasts two to five years on one battery. Watches with a date, alarm, chronograph function (i.e., with a stopwatch), or illuminated dial require more power and are more likely to be at the lower end of this range.
Typical signs of a weak battery
| Symptom | Probable cause | Action required |
|---|---|---|
| Second hand jumps in four-second intervals | Battery warning signal (EOL function) | Change battery, watch will run for a few more weeks |
| Watch suddenly stops | Battery completely discharged | Change immediately, otherwise risk of leakage |
| Watch runs irregularly fast or slow | Low charge level or contact problem | Check battery, clean contacts if necessary |
| Date no longer changes correctly at midnight | Insufficient voltage for the date mechanism | Change battery |
Many movements have a so-called EOL (End of Life) function: as soon as the voltage drops below a threshold, the movement switches to a four-second rhythm so that the remaining energy is sufficient to keep the watch readable for a few more weeks. This is not a defect, but a notification that allows time for an orderly change.
Changing the battery yourself or at a watchmaker: When to choose which
Whether a DIY attempt makes sense depends primarily on two factors: the design of the case and the water-resistance rating of the watch.
Suitable for DIY change
- Watches without a water-resistance rating or with a "splash-proof" protection class (up to 3 ATM)
- Watches with a screw-down or snap-on case back that can be opened with a watch case opener
- Simple everyday watches from the low price segment, where the cost of a watchmaker visit exceeds the effort
Better to go to a watchmaker
- Watches with a water-resistance rating of 5 ATM and above: Here, the seal must be checked and the case back closed with the correct torque after the intervention.
- Watches with a screw-in case back and special tools that are not available in the household
- Watches under warranty: A DIY intervention can affect the warranty claim depending on the manufacturer.
- Models with sensitive mechanisms directly under the battery holder, such as watches with a moon phase or annual calendar
| Criterion | DIY change | Watchmaker |
|---|---|---|
| Costs | Button cell: approx. 1-3 euros | Incl. seal check: 10-30 euros depending on the model |
| Water resistance | Can be lost after intervention | Is checked and restored |
| Risk | Scratches, misaligned case back, lost seal | None, at a professional shop |
| Suitable for | Everyday and entry-level watches without water-resistance requirements | Sports watches, diving watches, higher-quality watches |
Step by step: Open the case, change the battery, check the seal
Anyone performing the change themselves needs little, but should proceed in a structured manner. A scratch on the case back is negligible; a bent battery contact or a forgotten seal is not.
Required tools
- Case opener (case opener for snap-on backs) or screw-type case opener for screw-down backs
- Tweezers (antimagnetic, so the new battery is not magnetized)
- Soft surface so the watch does not get scratched
- Magnifying glass or loupe
- Replacement battery (the type designation is on the old battery or in the manual)
Procedure
First, remove the strap if it restricts access to the case back. Place the case opener vertically in the gap between the back and the case and lever it inward with a short, even pressure. Never press at an angle, as this leaves notches. Set the case back aside and remove the seal (a narrow O-ring that lies in the edge of the case back) with tweezers. If it is brittle or has visible cracks, it must be replaced before the case back is put back on.
Remove the old battery with the tweezers. Pay attention to the installation position: most button cells are placed with the plus side facing up, but not all. Insert the new battery in the same position without touching the contacts with your fingers (grease film from the skin can cause contact problems). Then check if the hands are moving again. If so, put the seal back, place the case back on straight, and press down evenly until it clicks into place.
Strap care by material: leather, stainless steel, and silicone
The strap bears the most stress of a watch because it absorbs sweat, moisture, sunscreen, and mechanical friction daily. Which care helps depends on the material.
Leather strap
Leather and constant contact with water do not mix. Anyone who exercises regularly or sweats a lot should consistently let a leather strap dry before putting it away. Leather can be cleaned with a slightly damp cloth and then air-dried, never in direct sunlight or over a heater. Leather care creams without silicones keep the material supple and delay surface cracking. A leather strap has a limited lifespan; it is a wear item and should be replaced if visible cracks appear before the buckle rubs or the seams come apart.
Stainless steel strap
Stainless steel is easy to care for, but collects skin flakes, detergent, and body oils in the links. A soft brush (toothbrush) and lukewarm water with a drop of neutral soap are enough to clean the links. Then rinse thoroughly and dry with a soft cloth. High-gloss polished stainless steel straps show signs of wear over time; a refresh with a polishing cloth without abrasive additives is possible; for deep scratches, only a watchmaker with a polishing motor can help.
Silicone strap and rubber strap
Silicone and rubber are the most robust strap materials for sports and everyday life. They can be rinsed under running water and cleaned with a soft brush. Important: Some cleaning agents and solvents attack silicone and make it brittle. Neutral soap and water are the safe way. Silicone yellows over time with some light colors due to UV exposure; this is a material process that no care can prevent.
When a water-resistance test is necessary after intervention
Every opening of the case is an intervention in the watch's sealing system. Whether the watch still reaches the specified water-resistance class afterward cannot be judged without a measuring device. A water-resistance test, technically known as a pressure test, checks with overpressure or underpressure whether the case and seal remain tight.
For watches that come into regular contact with water, i.e., from a rating of 5 ATM upwards, the following applies: after every case opening, a professional shop should perform the pressure test. This is the only way to rule out moisture entering the movement and leading to rust on the contacts over time. For watches that are merely "splash-proof" and treated as such by the wearer, the test is less urgent, but still sensible.
More about water-resistance classes and their practical meaning is explained in the article Waterproof wristwatch: Which protection class is enough for what.
Signs that the watch needs to go to a watchmaker
Not every problem can be solved with a new battery. The following symptoms indicate a finding that requires expertise and tools.
- The new battery is charged, but the watch still does not run: contact problem or defective quartz crystal (the component that generates the clock frequency)
- The watch has fogged up after contact with water: moisture has entered the movement and must be dried immediately, otherwise the circuit board contacts will rust
- The second hand is running, but the minute and hour hands are stationary: defect in the gear train (the system of gears between the movement and the hands)
- Crown can no longer be pulled or pushed properly: crown or crown stem damaged
- Case back cannot be opened: never use force. A crooked scratch destroys the seal groove.
- The glass is cracked: tightness can no longer be guaranteed, glass must be replaced before further care makes sense
An overview of which differences in watch glasses are important is provided by the article Sapphire glass, mineral glass, Hardlex: Thinking about watch glass and water resistance together.
Checklist: What you should check before and after the battery change
- Note the battery type of the old battery before it is disposed of
- Check the seal for cracks, pinch marks, and deformation
- Look for verdigris or corrosion on the battery contacts in the case
- Handle the new battery exclusively with tweezers, not with fingers
- Running check: Does the second hand start running immediately after insertion?
- Let the case back click into place straight and completely
- Do not bring the watch into contact with water for 24 hours after the intervention
- For waterproof watches: commission a pressure test at the watchmaker
