Archive for December, 2008

How to change the battery on a Casio ProTrek Solar Powered watch

Posted in Uncategorized with tags , on December 30, 2008 by gtouser

In my opinion it shouldn’t be necessary to change the battery on a solar powered watch for obvious reasons but searching on teh internet it seems that these watches are prone to battery failure. The battery is a Cobalt Titanium Lithium Rechargeable battery CTL1616 made by Panasonic and also SONY. Mine has already been replaced under waranty but when it failed again less than two years later Casio wanted more to change it than I can buy a new watch so I decided to do it myself.
First remove the strap by using a pin to compress the two pins in the usual way for any watch.

Now remove the four screws and take the back off


remove the rubber sheet to expose the battery cover, note this is not the battery but a sheet metal cover


Inser a needle into the cavity at the 12 o clock position and release the metal clip so the cover can be lifted and the battery slid out as shown in next photo


Slide the battery out. My battery had brown ooze at the join which doesn’t look healthy.


Put your new battery in observing polarity.

I found a link online for a comany that can supply them it is or get there from  BTW I have no connection with either company, information only.


Update : –  I fitted a non-rechargeable battery last October cost 20 pence on ebay (pack of 5 for £1) and it is still going strong with a “full charge” showing on the display after nearly a year of use

Summary: I wouldn’t bother with the expensive rechargeable CTL1616 when you can get this performance from a throwaway replacement cell.

Here is some data for the battery below for those that are interested





Nominal Capacity 18mAh


Nominal Voltage 2.3V


Standard Discharge Condition 1.0mA


Standard Charge Condition
(Constant Voltage and Constant Current Method)
Voltage 2.6V
Current 3.0mA
Time 24h


Cathode Active Material Lithium Cobalt Oxide


Anode Active Material Lithium Titanium Oxide


Energy Density per Volume 129Wh/l


Energy Density per Mass 38Wh/kg


Cycle characteristics(100%DOD)* More than 100 cycles


Operating temperature range -10~60�C


Weight 1.1g
* More than 70% capacity
discharge capacity versus load current

discharge capacity versus load current

Charge Characteristics

Charge Characteristics

more graphical data in the gallery below



How to change the headlight bulbs on a Mitsubishi GTO or 3000GT

Posted in car repair, Uncategorized with tags , , on December 21, 2008 by gtouser

This explains how to change the headlight bulbs on a Mitsubishi GTO also known as the 3000GT and Dodge Stealth S3

First switch on the headlights so they pop up.

Next disconnect the negative battery lead so that they stay up and the power is dead.

First drop the top bezel by removing the self tapping screws shown in picture


Next remove the top cover by removing four screws


Now remove the lower bezel as shown in picture


You can now see  the  headlight with only a sheet metal bracket holding it in position, remove the four screws. Soak the screws in Plus Gas or similar anti seize fluid and make sure the philips scredriver is a good fit as they are likely to be very tight and you don’t want to get them chewed. If it does happen you might be able to clamp a mole wrench or wrench with self locking jaws on the screw and turn it that way. Replace the screw with a stainless socket head screw  if this happens and put copper grease on it for the next time. It would probably make sense to change them all for this type in any case.



Here’s another close up of the  headlight



Here is a view of the connector on the  back of the headlight


Pull the connector off  and remove the headlight from the front and you are nearly done.

I fitted Philips X-Treme Power H4 bulbs to my Misubishi GTO as the  light from the headlights seemed weak. These replacement bulbs claim to give 80% more light than standard but are legal in the UK at least. This may be because the wattage is the same and the law is drafted like that but they are more efficient at converting Amperes into Candellas.

When you handle the bulbs be careful not to touch the glass as the grease from your hand would cause a local hotspot and premature failure. If it does happen you should clean the glass with methylated spirit or alcohol and kitchen paper to remove the grease.

Take the oportunity to lubricate all the moving parts in the pop up mechanism while they are accessible. I used ROCOL copper grease normally used on disk brake calipers partly because it doesn’t wash off so readily and partly because I have some.

If you have any silicone grease put it in the connector contacts before pushing it on the bulb and it will be less susceptible to corrosion caused by water ingress. If you don’t have any use WD40 it will be better than nothing. 

Once the bulbs are fitted reassembly  is the opposite sequence to dissasembly but should be quicker if you have greased everything.