How To Change A Watch Battery At Home
In this article
You can change a watch battery at home if you identify the case back type, match the old coin cell exactly, and handle the new battery with plastic tweezers rather than your fingers. The job is mostly patience and small tools, not a specialist workshop.
Read The Dying Cell Before You Buy Anything
Most quartz watches run on small coin-cell batteries. A weak cell can make a watch misbehave, but the first move is not to guess—open the watch and read the old battery. The old battery is a round silver battery inside the watch. Make note of the battery model number printed on it, such as SR626SW or 377. That printed code is your buying instruction. Without it, you are guessing at the one part that has to fit. If you want the broader context of quartz versus mechanical, Automatic Vs Quartz: The Real Difference lays out the divide.
The Small Toolkit That Makes The Swap Less Frustrating
The necessary tools are precision screwdrivers—the small precision screwdriver is what opens a screw back with screws—and a replacement battery with the same model as the old one. The screwdriver matters because many watch backs are held by tiny screws, and a proper precision tip gives you more control than a kitchen-drawer approximation. The replacement battery matters because a different code is a different battery.
Optional items make the work cleaner. Plastic tweezers let you lift and place the cell without adding finger oils. A soft cloth or mat protects the watch face while the watch lies open. A pin tool can remove the clasp connector to expose the case back fully, which helps when a bracelet crowds the work area. If the bracelet itself is the obstacle, How To Remove Watch Bracelet Pins At Home covers that separate job.
Four Case Backs, Four Different Conversations
Watch backs are not one thing. You will meet screw backs with screws, snap-on case backs, screw-down case backs, and hinged case backs. Each type tells you something about the watch before you see the movement.
Screw backs with screws appear on many mid-range quartz watches, smartwatches, and some fashion brands. They are common with Joycoast, Fossil, MVMT, and Skagen. The tiny screws usually sit around the perimeter. Work over a tray or cloth, because a screw that disappears into carpet is a screw you will not find.
Snap-on case backs are common on fashion watches, quartz dress watches, minimalist brands, and many wooden watches. They often look seamless from the back, with no visible screws. The safe move is to identify the type before applying pressure. If you are not sure, compare the back to the four families here and let the hardware decide the approach.
Screw-down case backs are found on dive watches, sport watches, tool watches, and higher water resistance models. They are very common on Seiko divers, Rolex, Omega, and most performance-focused watches. The name may sound like a screw back with screws, but the fact you need is simpler: this is a different family, and it tends to live on watches built for harder use.
Hinged case backs are typically seen on vintage watches, pocket watches, and some classic dress watches. They are rare on modern watches and usually have low water resistance. If you inherit a hinged-back piece, treat the hinge as the fragile part and let the watch tell you how it wants to open.
Opening A Screw-Backed Case And Reading The Old Cell
For a screw back with screws, the precision screwdriver is the opening tool. Keep the screws in a shallow dish or on a tray; the soft cloth or mat from your toolkit can serve as a landing zone. Once the back is off, you will see the old battery again: a round silver battery inside the watch. The model number printed on it, such as SR626SW or 377, is the code you already noted. Write it down or photograph it if you have not done so. The code is the only reliable way to match the replacement.
This is also the moment to check whether the case back is actually a screw-down type that only looks like a screwed-on plate. If the watch is a dive watch or sport watch, the odds lean toward a screw-down back. If it is a fashion quartz or minimalist piece, a screw back with screws or a snap-on back is more likely. You do not need to memorize every brand; you need to recognize the hardware in front of you.
Matching The Numbers And Lifting The Cell
Battery codes look fussy, but one common example simplifies quickly. SR626SW and 377 are the exact same battery size and type, just labeled differently by manufacturers. That means a watch asking for one can use the other, provided the physical code matches the cross-reference.
Concrete examples help. The Joycoast Chronograph with sub-dials uses an SR920SW / 371. The Joycoast Kaleidoscope uses the same SR920SW / 371. The Joycoast OG (Hex Watch), Joycoast Northstar (Chocolate Rose Watch), Joycoast Mini Northstar (American Walnut Watch), and Joycoast Fruitloops OG Watch all use SR626SW / 377. Joycoast also lists a store service in Lincoln Park, Chicago, IL, if you would rather hand the watch to the brand. If you own one of those models, the battery guesswork is already done.
Removing the old battery should be done with plastic tweezers or a non-metal tool. Avoid touching the battery or internal components with your fingers to prevent damage. Finger oil is not a tool, and the inside of a watch is not the place to test that idea. Once the old cell is out, place the new one with the same care: plastic tweezers, no finger contact, and a clean surface underneath. If you are resetting a date after the swap, avoid the classic trap by reading Why You Should Never Change Your Date Between 9pm And 3am. For a dedicated step-by-step battery guide, How To Replace A Watch Battery Yourself is the companion piece.
Closing The Case And Checking The Tick
With the new cell seated, the next job is putting the case back exactly as it came apart. Screw backs with screws go back screw by screw; snap-on, screw-down, and hinged backs each have their own hardware, and the type you identified at the start is the type you are closing now. Do not force anything. The watch is small, and the parts around a case back are smaller.
For quartz models, a battery replacement kit makes the swap simpler.
When the watch is together and the seconds hand is moving again, you can test your eye for dial details with the daily guessing challenge at Watchdle. It is a low-stakes way to enjoy watches after the practical work is done, and it pairs well with the quiet satisfaction of a fresh quartz tick.
FAQ
Are SR920SW and 371 interchangeable?
Yes. SR920SW and 371 are identical and interchangeable. A watch that calls for one can use the other.
How long should a quartz watch battery last?
The typical lifespan is 1–3 years. If a watch stops or runs oddly before that window, the cell is the first thing to check.
What are the signs of a watch battery voltage drop?
A dropping voltage can make the watch stop completely, skip seconds or lag, stop keeping accurate track of time, or show a faded or blank digital screen. These are the common failure modes to watch for.
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