Orient quartz watches run on standard button cell batteries, and replacing one yourself takes about ten minutes with the right tools. The battery type depends on the movement inside the watch, not the model name printed on the case back, so confirming the caliber comes first. Most modern Orient quartz watches use either a 371 (SR920SW) or 377 (SR626SW) battery, though older models may differ.
Before opening anything, check whether the watch is still under warranty. Orient’s international warranty typically covers two years from purchase, and unauthorized case opening can void it. If the watch is within that window, a service center replacement is the safer route. If it’s older, DIY is a reasonable option that costs roughly $5–$15 in tools and a battery, versus $20–$45 at a shop.
Tools That Prevent Case Damage
The tools matter more than most tutorials suggest. Using a knife, a flat screwdriver, or improvised tools is the fastest way to gouge the case back or scratch the lugs. A proper kit includes:
- Case back opener — a three-prong or adjustable wrench for screw-down backs, or a rubber ball for snap-off backs
- Case holder — a clamp or cushion that grips the watch without scratching it
- Plastic pry tool or case knife — for snap-back cases
- New battery — confirm the correct code before purchasing
- Latex or nitrile gloves — skin oils accelerate corrosion on battery contacts
- Tweezers — preferably plastic-tipped, to avoid shorting the movement
A basic kit like the Seizaiken 377 SR626SW 1.55V 0% Hg Silver Oxide Watch Battery (2 Batteries) Made in Japan by Seiko covers the most common Orient battery size, but confirm your movement first.
Identify the Movement and Battery Code
Orient does not print the battery code on the case back. Instead, the movement caliber is stamped on the movement itself, visible only after opening the case. However, you can narrow it down before opening:
- Orient Caliber F6, F7, F8, and 46-series movements typically use a 371 (SR920SW) battery
- Orient Caliber 48-series and older quartz movements often use a 377 (SR626SW) or 364 (SR621SW)
- Orient solar models use a rechargeable cell, not a standard button battery — do not substitute a silver oxide battery
If you already have the case open, the caliber is usually engraved near the balance wheel or stamped on the main plate. Cross-reference that number with a battery equivalence chart rather than guessing from the old battery alone, since previous replacements may have used the wrong cell.
Open the Case Back
Orient uses three types of case backs across its quartz lineup: screw-down, snap-off, and occasionally a bolt-down style on dive-inspired models.
Screw-Down Case Backs
Most Orient quartz watches with water resistance ratings of 50 meters or higher use a screw-down case back. These have notches or a hexagonal shape around the edge.
1. Place the watch in a case holder, face down
2. Select the correct die or pin setting on your case back opener
3. Apply firm, even pressure counterclockwise
4. If the back resists, apply a small amount of watch-specific case back lubricant and wait a minute before retrying
Snap-Off Case Backs
Dress watches and thinner quartz models often use snap-off backs with a small notch at one point on the edge.
1. Insert a case knife or plastic pry tool into the notch
2. Gently twist the tool to pop the back upward — do not pry hard, as the lip is thin
3. Work around the edge if it doesn’t release on the first attempt
Checkpoint: If the case back does not budge after moderate effort, stop. A stuck back usually means either the gasket has fused to the case or the back is actually screw-down and you’re prying at a seam. Examine the edge under bright light for threads or a notch before applying more force.
Remove the Old Battery
Once the case is open, you’ll see the movement with the battery held by a metal spring clip or a small retaining plate.
1. Note the battery’s orientation — the positive side is usually marked with a “+” and faces a specific direction. Photograph the movement before touching anything
2. Use plastic tweezers to lift the retaining clip or slide the battery out from under it
3. Remove the battery without touching the exposed contacts with metal tools
4. Inspect the battery compartment for white powder, crusty residue, or green corrosion
Likely cause of failure: If you see corrosion, the old battery has leaked. This changes the job from a simple swap to a movement cleaning. Stop here and assess whether the corrosion has reached the circuit board or coil. Minor residue on the clip can be cleaned with a fiberglass pen and isopropyl alcohol, but corrosion on the movement itself typically requires professional service.
Install the New Battery
1. Check the new battery’s code against the old one — dimensions and voltage must match exactly
2. Place the battery in the compartment with the correct side facing up, matching the orientation you photographed
3. Press the retaining clip back into place with plastic tweezers
4. Ensure the battery sits flat and the clip makes solid contact — a loose clip causes intermittent power loss
Verification: Before closing the case, test the watch. Set the time, pull the crown to the hacking position, and confirm the seconds hand stops. Push the crown back in and confirm the seconds hand starts moving. If the hand doesn’t move, the battery is likely upside down, the clip isn’t making contact, or the movement has a separate issue.
Close the Case and Restore Water Resistance
The gasket is the most commonly skipped step, and it’s the one that turns a successful battery swap into a moisture-damaged movement months later.
1. Remove the old gasket from the case back groove
2. Inspect it for cracks, flattening, or stiffness — if it’s hard or brittle, replace it
3. Apply a thin layer of silicone grease to the new gasket
4. Seat the gasket evenly in the groove
5. For screw-down backs, tighten firmly but do not force — the gasket compresses, and over-tightening can strip the threads
6. For snap-off backs, press down evenly around the edge until it clicks into place
Stop point: If you don’t have a replacement gasket and the old one shows any signs of wear, close the watch but treat it as not water-resistant until a new gasket is installed. Orient gaskets are inexpensive and available from parts suppliers, but running a watch with a compromised gasket through water risks permanent movement damage.
When to Escalate to a Professional
A battery replacement is within reach for most owners, but some situations warrant a watchmaker:
- Corrosion or leakage visible on the movement — the battery has damaged the circuit board or coil
- The watch runs but loses significant time — quartz movements can drift, but sudden large errors after a battery change suggest a contact issue or movement damage
- The case back won’t open after reasonable attempts — forcing it risks case damage
- The watch is a solar model — rechargeable cells require specific replacement procedures and testing
- The watch is under warranty — opening it voids coverage
A professional battery replacement typically costs $20–$45 and includes a new gasket and pressure testing. For a $150–$300 Orient quartz watch, that’s reasonable insurance if you’re unsure about any step.
FAQ
Can I replace my watch battery myself?
Yes, if the watch has a standard quartz movement and you have the correct tools. The process takes about ten minutes and requires a case back opener, a case holder, plastic tweezers, and the correct battery. Watches with complications like chronographs or solar movements are better left to a professional.
How do I get the back of my watch off to replace the battery?
Orient watches use either screw-down or snap-off case backs. Screw-down backs require a case back wrench with the correct die size, turned counterclockwise. Snap-off backs have a small notch where a case knife or pry tool can be inserted to pop the back off. Never use a knife or flat screwdriver, as these slip and scratch the case.
How do I pop the back off a watch?
For snap-off case backs, insert a plastic pry tool or case knife into the notch at the edge of the back, then twist gently to lift the back upward. If the back doesn’t release, rotate the watch and try the tool at a different point around the edge. If it still won’t budge, it may be a screw-down back that you’re mistaking for a snap-off.
How do I open a quartz watch to change the battery?
Place the watch in a case holder to prevent slipping, then use the appropriate opener for the case back style. For screw-down backs, use a wrench or die-based opener. For snap-off backs, use a case knife or pry tool at the notch. Once open, photograph the movement, remove the old battery with plastic tweezers, and install the new one in the same orientation.
The We Know Watches editorial team brings together over 40 years of combined watch collecting, trading, and repair experience. Our editors have owned and handled watches from every major brand — from entry-level Seiko 5s to Rolex, Omega, Patek Philippe, and independent Swiss watchmakers. We’ve bought and sold at auction, worked with authorized dealers, visited manufacturing facilities in Switzerland and Japan, and serviced hundreds of movements ranging from the Seiko 7S26 to the Longines L888. Every guide and review we publish is based on hands-on experience, original research, and consultation with professional watchmakers. We do not accept payment for reviews, and we clearly disclose when we use affiliate links.