Change a watch battery yourself – step-by-step guide
Yes, you can change the battery on most quartz watches at home without taking them in for service. You will need a new watch battery of the correct type, a case opener, and tweezers – it takes about five to ten minutes. In this guide, we will go through all seven steps, from identifying the correct battery to closing the watch again, so you can do it safely and without damaging the movement.
What do you need to change a watch battery?
Before you begin, you will need three things: a new battery that matches your watch model, a tool to open the case back, and tweezers to handle the battery. You should never touch the battery with bare fingers – skin oils can damage contact surfaces in the movement.
- New watch battery – the most common types are SR626SW, SR621SW, and CR2032. The battery type is stamped on the old battery or listed in the watch's manual.
- Case back opener (case knife) – for snap-off case backs, or a screwdriver tool for screw-down case backs.
- Anti-static tweezers – to lift out and insert the battery without statcially discharging it.
- Soft cloth – to place the watch on so the crystal doesn't get scratched.
How do you know which battery fits your watch?
The battery type is usually stamped on the old battery once you have opened the watch. Alternatively, the information can be found in the watch's manual. The most common batteries in wristwatches are silver oxide batteries (SR-series) and lithium coin cell batteries (CR-series). Do not confuse the sizes – a battery that is half a millimeter too thick can damage the movement.
Step 1 – Identify the case back type
There are three common types of watch case backs:
- Snap-off case back – the most common. The case back is pressed into place and can be pried open with a case knife along the edge.
- Screw-down case back – the case back is screwed off clockwise. Often used on more durable sports and diver's watches.
- Screw-down case back with screws – four to six visible screws on the back. Requires the correct screwdriver size.
Step 2 – Clean the watch and ground yourself
Clean the outside of the watch with a soft cloth before opening it. Then ground yourself by touching a metal object connected to the ground – this neutralizes static electricity that could otherwise damage the movement's electronics.
Step 3 – Open the case back
Place the watch on the cloth with the crystal facing down. Find a small notch on the edge of the case back (snap-off case back). Insert the tip of the case knife into the notch and pry open the case back with gentle but firm pressure. Note: If the watch is water-resistant, there will be a rubber gasket inside the case back – set it aside on a clean surface.
Step 4 – Remove the old battery
Use the tweezers to carefully lift out the old battery. Note which way it is oriented – the plus side (+) should normally be facing up. Check the battery designation, such as SR626SW, before purchasing a new one.
Step 5 – Insert the new battery
Place the new battery with the correct side up. Gently press it down with the tweezers until it snaps into place. Immediately check if the second hand starts moving – if it does, the battery is working and the contact is good.
Step 6 – Replace the rubber gasket (if water-resistant watch)
Check that the gasket is intact and place it back in its groove in the case back. A damaged gasket means the watch is no longer water-resistant – replace it or have a watchmaker do it.
Step 7 – Close the case back
Snap-off case back: place the case back in position and press evenly with your thumb around the entire edge until you hear a click. Screw-down case back: screw clockwise and tighten without overtightening. Set the time and date if the watch reset.
Do you have a quartz watch that needs a new battery?
If you are unsure whether your watch is suitable for DIY battery replacement – for example, if it has a water resistance deeper than 50 meters – it might be worth having a watchmaker do it. Feel free to read our guide on when you need a battery change versus service.
Want to see watches that don't require battery replacement at all? Automatic watches are powered by kinetic energy and never need a battery change.
Can I change the battery on any watch at home?
Most simpler quartz watches with snap-off or screw-down case backs are fine to change at home. Watches with high water resistance (100 meters or more) or mechanical watches should be taken to a watchmaker.
How do I know which battery fits my watch?
The battery type is stamped on the old battery when you open the watch. Common designations: SR626SW, SR621SW, and CR2032. Take the old battery with you when you shop.
Does the watch lose time or date when I change the battery?
Yes, the watch often resets. Set the time and date immediately after you have closed the case back and seen that the second hand is moving.
How often do you need to change a watch battery?
Every two to five years depending on the watch type and functions. Watches with alarms, backlighting, and step counters drain the battery faster.
Does the watch lose its water resistance when changing the battery at home?
Not if the rubber gasket is intact and reassembled correctly. Watches with 100 meters+ water resistance should be tested by a watchmaker after replacement if you plan to swim with them.
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