I am not sure why the thing resets under cold water. I don't think it is due to the storage battery. Try holding your hand over the face of the watch for a minute or so. If it resets then it might be the battery.

Have you tried pushing the light button? Does it cause any issues?

Is it only cold water or will warm water cause this also?

It could be that the water is touching something in the light button and doing a reset.

If in fact the watch is dying, it is easier to replace it then fix it. While a new storage battery might fix it and this is cheap if you can do the work yourself, the module might be the actual issue

Look towards a GW-2310 or GW-2310 if you want a similar watch.

 

It could be ESD or bad ground on mains.

 

What's ESD and what's a bad ground on mains mean? What do these 2 things looks like?

 

I’ve just realised I could give a bit more detail than my original post. When I say it resets, the display goes blank for a second and then it comes back on but with the time set to, I think 2000-01-01 00:00.

I’ll try to reproduce the issue in the ways that have been suggested.

 

I know the Protrek PRW-3000 had a problem with static electricity in which it would reset from. Folks reported that just the act of putting on a fleece sweater would be enough to reset it. Casio could not fix it so they discontinued it and came out with the PRW-3100 with a new module.

However i did not think water could do this unless it is shorting out a button

 

need a new battery for sure
those G-2300 like yours had bad battery (by bad I mean it doesn't last more than 10, 12 years)

if you can't find the same rechargeable battery (CTL-1616???), put in the non-rechargeable that fits (don't remember but it might be the CR-1216 from other Gshocks)
I did it for mine a long time ago (maybe 3-5 years), still running fine

 

I have just tried: running it under cold water, warm water, sitting it in a sink of cold water, covering up for a few minutes so it is in darkness, and also pushing the light button but have not managed to reproduce the screen going off or it resetting.

I wasn't sure if this one had auto light as I've had that on some other G-Shocks before - turns out it doesn't after trying a long push on the light button.

I can live with the fault if it is only very occasional as it has been really obvious when it happens - the time and date completely changing is easy to notice compared to, say running slow or fast etc.

It would be nice to get the battery replaced if that's possible and not too expensive. I've not had the best of luck with opening up watches in the past. Unless it's really easy to do I would prefer to get it done at a repair place. I just looked online for what battery it needs but was unable to find it for this watch. (What happens with the solar charging if it is not a rechargeable battery by the way?)

 

What happens with the solar charging if it is not a rechargeable battery by the way?

The module is "connected" to the solar panel by two tiny springs in most solar G's. If you DO end up down the standard battery line, you'll be best off taking those springs out so no charge runs to the battery. However that will obviously mean an extra step for you of removing the module, not just the caseback if you're literally installing a new rechargeable battery!

There are some very good sites that explain how to change a G-Shock battery. Here's a link to a UK site. It's a "normal" Casio not a G, but the steps will be almost identical for your watch:

Replacing a Watch Battery in a Snap Back Watch Case from WatchBattery (UK) Ltd

It is very easy and you'll be very happy once you manage it yourself [emoji106]

Sent from my Pixel 3a using Tapatalk

 

Is it a 1616 battery ? I have replaced a few and i am sure i have one spare(have to check )
I dont mind changing the battery for you(im UK) as have done plenty for me, others to. Obv need to post to me though, but the offer is there and its free for the love of G Just message me if you decide. not a problem at all.

Batteries are around the £10/£12 usually , so defo worth a try. Have a look at the casio manual online with your module that should say what battery, even youtube may have the answer,

I can also message you a step by step with pics to do yourself. Thats no trouble to.

 

Big ups to you @ven, this post epitomizes all that is good about F17! Give his offer some thought @picknmix, though I'm 110% sure you could pull off the battery replacement on your own if you go slow, work over a plastic bin to catch any wayward springs, and be sure to lube your gasket with silicone grease before you button everything up. If any issues come up, we'll be here to guide you, but you'll feel empowered by the work.

FWIW, looking at the manual for module 2184 (module 2184 PDF), Casio calls for a ML-2016 rechargeable battery (3.0 volts) in the G-2300, so I'm not sure the more common/modern CTL-1616 rechargeable battery (2.3 volts) will work. Hopefully our electronic engineers will chime in, but ML-2016 cells are still widely available for pretty cheap, so that's what I'd recommend.

FYI: Pretty much every Casio has the "module number" (usually four digits) engraved on the case back often surrounded by a small box, and full manual PDFs can be looked up/downloaded here.

 

Thanks so much for the help guys, for all the information in general and to @ven for your kind offer.

I'll have a think about what to do next!

I've checked and it's definitely 2184 written on the caseback. The site that you linked to with the instructions has the ML-2016 in stock @nonconformulaic so that is great.

@sodamonkey I saw those little springs in a YouTube video on replacing Casio batteries so that is good to know that is what they are for. EDIT-actually, these were springs that are always removed for a battery change in the one I saw so I don't know if these are the same springs we're talking about.

 

Trust us @picknmix, you got this! Changing a G-Shock battery is only slightly more technical than filling you car/bike with gas.

 

If you are going the battery change route with a new solar storage battery, spend a bit more and get a new case back gasket as odds are the thing will be old and ready for a replacement.

 

Rechargeable battery, o-ring, silicone grease and even some finger cots have all been ordered!

 

Excellent!!

Let us know how you get on with your first battery change 👍

 

I did the battery change!

I fitted a new ML2016 battery and greased o-ring.

As well as the link from sodamonkey on post #11 above I had also watched "How to Change a CTL1616 Rechargeable Watch Battery in a Casio G-Shock"

Although this was not for the same module and battery I watched it to get an idea of what the process might be. Luckily, on the G-2300 with the 2184 module the process was simpler with no need to remove springs.

I did not remove the strap which made the process slightly more difficult. I thought it would be a matter of removing screws as in the Esslinger video but it turns out the strap is held on with a spring bar and I do not have a removal tool so I left it on.

The screws holding the caseback on were not very difficult to unscrew so when I put them back in after completing the change I did not overtighten them.

There was a bit of dirt or possibly corrosion around the outer bits of the caseback on the inside and I cleaned it up with a cotton bud. That's probably not the best thing to use as it can leave little bits of fibres behind but it's all I had. The o-ring that was on there looked like it had been doing its job well as anywhere beyond it looked clean.

When I lifted off the caseback the whole module came out stuck to it straight away. That was a bit unnerving at first. I gently prised the module away and lifted off the black rubber cover. Luckily nothing fell off the module. There were two gold springs at the front that touch the solar panel and one spring at the back but they were fixed in.

Replacing the battery was fairly straightforward. I had to stick a pin into the little latch that holds the battery on which was pretty hard to see but it popped open cleanly after that. Wearing the finger cots was definitely a good idea.

The old o-ring had stayed stuck to the caseback but I installed the new one onto the back of the watch body where there's a recess for it to sit in. This bit and reattaching the back would have been easier with the strap removed but it wasn't too bad.

Thanks again for all the help and for convincing me to do it! I should have taken some pictures for the record but I was too busy concentrating on just trying to get it done successfully.

I'll see how it runs with this new battery. I'm hoping I might get better accuracy too as it was about +0.5 seconds per day before - not terrible but not great for quartz.

 

thanks for keeping us update
if not because of the battery, the 2300 will out live our lives without needing any surgery