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Thank you for contacting FIxYa.<br />
The G Shock in one of the most advanced watches, and also a very complex watch. Your best bet is to go to their website for support from them. Thank you and best regards.<br />
On the solar charge watches, they use a chargeable Lithium battery. It is NOT an off the shelf regular battery! It is best to send the watch to the factory service rep in your area for a battery change.
In many of these models the battery is using solder contacts to the circuit board. The person changing the battery will require the original spec battery, and be equiped to do surface type soldering.
When working on this watch, the factory service will change the seals and do a pressure water resistance test. The regular corner watch service store is not equiped to do this type of testing.
Normaly, the battery in solar watches should last more than 5 years. Some are going past 10 years!
The general instructions for the for the 2608 and the 2688 are pretty much the same. However you can go to this link and type in 2688 for your module number and get specific instructions. http://world.casio.com/wat/download/en/manual/