Replacing the Battery on a Timex Ironman Watch
You have a Timex Ironman watch? Sure you do. Want to replace the battery? Right. Have no idea what the hell an 'AC Pad' is? Read on.
Here's some things to remember.
- This information is provided only to show you how I did this...
- You might void your warranty. You probably already
did just by thinking about opening your watch's case.
- If you're not careful, you could compromise the watertightness
of the watch, or lose pieces, or accidentally inhale
a spring, or something.
- This is not intended to encourage any such behavior on your part.
Don't do this. Go away.
- OK, that been said, here's what I did!
Replacing the Battery
- First, open the case. On this particular Ironman, there are
4 screws.(fig 1). TAKE NOTE of how tight the screws are as
you loosen them; they will need to be replaced with the same torque.
- Look at the sticker covering the battery, with
vague instructions on how to reset the watch.
Note carefully the orientation of the sticker, and in particular any
arrow or triangle. This sticker will need to be replaced in the same
orientation...some users take a digital photo of the sticker/watch
for reference (thanks Tom Smith).
- Next, locate the All-Clear (AC) pad
by looking along the triangle's direction.
It is usually a small exposed solder pad
on the circuit board of the watch. It may or may not be labelled 'AC'.
(fig 2) Some users report that on some watches the AC pad is
below part of
the plastic frame, reachable through a small hole (thanks Larry
- Carefully lift a corner of the sticker; it can then be grabbed
with fingers. Pull carefully.(fig 2b)
- Unscrew the single screw on the battery holddown strap.
(Remember that your Ironman model may be different: some clips can be
released using a pin on the opposite side without removing the screw,
some have 2 screws, some have a clip with no screws.) (fig 3)
- Lift up the battery strap. Drop in the new battery.(fig 4)
Resetting the Watch
- The watch may now need to have its memory reset and cleared.
Sometimes the watch will start running correctly on its own
after the battery strap is replaced, but if the display is garbled or
blank the reset often works.
NOTE! Doing this incorrectly may damage
the electronics of the watch! Do this only if the watch is not already
- For this particular model, the sticker covering the battery
indicates that resetting is accomplished by shorting the AC
pad that was located earlier (see above)
to the battery's (+) side.
(This sticker says:
"AFTER BATTERY INSERTION - SHORT AC PAD AND BATTERY (+) TO RESET".)
This can be done by touching the pad and the
top of the battery simultaneously with a pair of all-metal tweezers, or
a paperclip. (fig 5,5b)
- When reset, the watch may temporarily display something
other than the time - in this case the number '860006'. (fig 6)
- Shortly, the watch should start running at 12:00 (fig 7)
- If the watch circuit board has come up out of the casing,
it can be lowered back into the case by carefully pushing the spring contacts
for the watch buttons inwards one by one, while gently pushing the board
back down into the case.
- For any watch that is water-resistant, there is an O-ring
with which the case back must make good contact. Any debris that has fallen
either onto this O-ring OR inside of the case backing must be carefully
removed. This can be done by swabbing with a lint-free swab, but note that
this may remove grease which is used to ensure the seal. If you do this,
you should consider replacing it with some grease that is
appropriate for watch O-rings; the wrong type of grease may deteriorate
the O-ring, the plastic, and/or the electronics.
Replace the sticker in its original orientation.(fig 9)
- Screw down the backing evenly; this is done by replacing the
screws in a star or cross pattern. First replace the screws without
tightening, then rotate through the screws at least twice in the order
shown (fig 10), tightening only a very little at a time until the
original tightness has been reached.