Help on Replacing your Watch Battery from WatchBattery (UK) Ltd
How to Replace a Watch Battery in Your Watch
So how do you replace a watch battery in your watch?
The instructions for changing a watch battery will depend on the type of watch you have. Click the links below to find help on the different steps in replacing
a watch battery for different types of watches:
Step 1: Find the battery code: In order to identify the correct replacement battery for your watch you will need to know the battery code. Sometimes
this is printed on the back of the watch - as with some Timex watches - but in many cases you will need to
open your watch case to see the code on the battery. The code can take various forms such as:
Once you know the battery code you can use this to identify the correct replacement battery on our site:
Step 2: Search site for battery: Simply type the battery code you have into the search box here and it will take you to a list of links to the correct
Step 3: Don't have the original battery? If you no longer have the old battery for your watch and do not know the code for the battery you can still identify it
by measuring the hole where the battery fits in the watch. Use our cross reference table here to sort by diameter or thickness to find the closest match to the dimensions
you have measured. You can then click through to order the battery.
Once you have opened the watch case you will need to remove the old battery and replace it. There are a number of different ways in which batteries are held in
place the watch movement. Sometimes they are held in by a spring clip, sometimes by a retaining bar, sometimes by a plastic cover. In some cases
it will be neccessary to loosen or remove some screws to remove the retaining clip, in others the battery can be eased out of the battery compartment.
Here are some examples of the types of battery retainers you are likely to see:
Once you have removed the old battery, putting in the new battery is simply a reversal of the procedure above. Using the tweezers or other non-metalic tool ease the battery
back into place and, if required, screw the retaining bar back in place.
Before replacing the back of the watch first check that the watch is working, if it is then all is ready for you to replace the watch case back. When putting the watch case
back on to the watch be careful not to loose or damage the rubber o-ring seal. This is important in keeping the watch water tight (see our
Problems Help page).
a) Closing a screw type watch back
With a screw back simply place the back on to the watch case and twist the back clockwise to screw it back in place. Tighten carefully using a
Screw Back watch
opening tool or similar.
b) Closing a watch back held on with screws
With a back plate held on with screws, using a small screwdriver replace each screw and tighten gently so as not to strip the threads.
As long as you have put the back on the watch securely and the o-ring is undamaged, the watch should retain its original water proof performance. The water resistance
performance can be helped by putting a small smear of
silicon grease on the o-ring, but be careful
that this does not go inside the watch case.
Most high street jewellers will not be able to test the water proof performance of a watch on their premises, and so after changing the battery will not guarantee
the water proof rating of the watch, therefore if you require your watch to be guaranteed water proof (such as a diving watch) it is likely that the watch will have to be
The test equipment required to do this costs a couple of hundred pounds and consists of a small tank which is half filled with water. The watch is suspended in the air space
above the water and the tank is sealed. The tank is then pressurised with a hand pump to the required test pressure. Once at this pressure, the watch is lowered into the water
and then the pressure released from the tank. If bubbles are seen coming OUT of the watch then clearly it is not water tight (well, not air tight actually). The seal will
have to be changed again, the back retightened and the test repeated.
2. The digital display on my watch is not working.
Click on image to enlarge
If the display on your digital watch is not working or not showing the correct display then it is likely that the watch needs to be reset. If you remove the back again,
you should see some indication of a reset hole on the watch's movement. This is sometimes marked with the letters "AC" (All Clear).
Click on image to enlarge
This needs to be shorted out against the case of the watch or the top of the watch battery. Using a paper clip or a pair of metal tweezers place one leg
into the hole marked "AC"and touch the other leg against the main movement housing or the watch battery (creating a temporary short circuit). This should reset
1. My watch still won't go with the new battery.
New battery failure is very rare, so if the watch fails to start with a new battery, it may be that the watch has stopped working for some other reason and you may
need to take it to a watch mender. However, there are a couple of things you can try first:
a) The obvious one is to check that the winder (crown) is pushed fully home.
b) If so, then has the watch been left standing with an old battery inside it for a long period of time? Sometimes it can be difficult to get the movement working
again if it has been stopped for a while. Placing the watch in a warm place (like an airing cupboard) can sometimes "loosen" things up sufficiently to get the
mechanism working again. We have fitted several new batteries to watches which have started for a while then stopped. Leaving them in a warm airing cupboard over night has actually
got them going again. You can also try moving the hands and tapping the watch gently to see if that will encourage it to start moving.
It is always best to replace
a battery in a watch as soon as the watch stops working.