CEDU changes a battery.   

One day the time will come when your trusty dive computer will tell you it is time for a change, and you will go out and replace it's battery.

The following is an account how I changed a battery in my Monitor M2 dive computer.

1.  First turn over the unit and remove the plastic back.

Removing the black plastic back cover revels the guts of the electronics.  The battery is on the right connected to the red and blue leads.

2.    Second: dig out the soft electrical "potting compound" from the battery compartment.

Would you expect that I use anything other than a dental tool, a discoid-cleoid in this cased, to remove the potting compound?
 

3.    Lift out the battery, then un-solder the leads.

Be careful when you lift up the battery, do not use excessive force.
(Excessive force is easily noted by the sound of the case cracking, indicating a destroyed computer.  Ooops!)

4.  Now go ahead and solder the new battery to the circuit.
(Battery used is a LR-07 type.  3.6 volt, Lithium)

Red lead to the Positive (+) lead, and Blue lead to the Negative (-) lead.

5.    Trim the excess lead off the battery, and tuck it neatly into its' compartment.

6. Next step is to seal the battery using an appropriate electrical potting compound.

I used a soft RTV Silicone (GE RTV-6126)

The potting is mixed in a 1:1 ratio, then using a vacuum pump it is degassed prior to pouring.
(The degassing removes bubbles which result from mixing.)

7.     Degassed potting compound is poured into the battery compartment and allowed to set overnight.

The pour is clean and no air bubbles are trapped.  The battery is completely covered with potting compound.

8.    Finally you can re-assemble the computer and go dive with it.  Now wasn't that simple.

Fine Print Notice:

    This webpage was provided for your entertainment only.  Please do not try this at home without proper training because the chemicals used, and the vapors released are toxic to skin and lungs and there is a high likelyhood that damage to the unit can occur by misplaced forces.  This page is by no means is a substitute for factory trained technicians or OEM engineering support required for the proper changing of batteries, or light bulbs for that matter.