Suunto Favor Dive Computer
My dive computer is a Suunto "Favor".
It is a simple little golf ball sized rig, and in most
situations turns on all by itself when immersed in water.
It cost me about $228 back in August of 1999.
It is a great little computer, the only limitation being
that it does not support the use of nitrox, which has yet
to be an issue in what I do.
I found a PDF copy of the user manual
online (66 pages) and have stashed it here for future reference.
It can be activated out of the water by wetting your fingers
and touching both "COM" and "PLAN ON", once activated you
can roam through various modes by touching the three
contacts ("COM", "PLAN ON" and "TIME MODE") in various ways.
The battery is a 3 volt lithium CR 1/2 AA unit.
There is all kinds of confusion about what battery you can
use for the replacement (being that lithium CR 1/2 AA
batteries can be obtained in both 3.0 and 3.6 volt versions).
The original battery is a 3.0 volt varta and you definitely will
not go wrong replacing the battery with one of these.
You also need to install a new O-ring when you replace the
battery. What I did in 2012 was to find a replacement kit
which includes the battery, O-ring, some silicone grease,
and a bunch of other O-rings (so you could replace every
O-ring in the unit should you want to). I bought this on
Ebay for just under $20 including shipping - the kit includes
the Varta battery. I saw a report from someone online who
replaced the battery with a 3.6 volt version and said that
the computer "seemed to be working fine", but I am uneasy
about this and feel it is safest and wisest to do the replacement
with the exact battery originally used.
To replace the battery, the game goes like this:
If you cannot get a depth reading of zero, contact Sea-Quest
customer service at 619-438-1101
- Be sure the unit is dry and clean.
- Remove backplate by loosening 4 phillips screws.
(The back of the unit boldly proclaims "do not remove screws")
- Remove battery compartment cover,
carefully place it with sealing surface up and keep it clean.
- Remove and dispose of O-ring even if it looks fine.
- Lift battery carefully, beginning with positive end,
but keeping the battery horizontal, avoiding prying force.
- Inspect battery, contacts, and housing for moisture,
corrosion, and such.
- Install new battery with care as to polarity
(reversing polarity will clear calibration data and
require a return to factory), do not touch contacts.
- Touch COM and MODE/TIME to start the computer.
Ensure that it displays a depth of zero.
- If it does not start with zero depth displayed,
remove battery, wait a minute, reinsert batter, wait an hour,
then restart computer, do not touch contacts during the hour.
- Install new O-ring with thin film of pure silicone grease.
It should be shiny with no visible grease.
- Gently place battery cover in place, but do not push down on it yet.
- Put your thumb through the backplate hole and push the battery cover into place.
Maintain pressure and check that the O-ring has not extruded out.
Maintain pressure as you tighten the four screws.
Tighten in a criss-cross pattern, not one screw all at once.
Only a snug fit is required, do not overtighten.
- Make a final check that the batter compartment is in place and that
the O-ring has not extruded.