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Discussion Starter #1
Before purchasing I looked at several of these watches and none of them had a High charge, the current watch I have now has been in the sun for about half a day and under regular house light for at least 2 days now and I have yet to wear it making sure it gets as much light as possible. It is still on Medium charge, I realize most of these watch models are a few years old and have been sitting on displays and the battery does not hold a charge as good as it did when it was brand new as typical with most Li batteries, is this just something normal to expect out of these watches or is it just luck of the draw on the battery inside the watch.

Thanks
 

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Discussion Starter #2
I should also mention i have read the entire manual as i do with every watch before even using them. I understand the hours and time table for lux and levels. It just makes me wonder if these rechargeable batteries like most will eventually not reach full capacity during the life of the watch.
 

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It's probably luck of the draw and depends on exactly how long the watch has been sitting on a shelf or in a display, and whether the watch was still in "Power Save" mode from the factory.

If you check the owner's manual, you'll see that Casio solars can take a couple of days of DIRECT, OUTDOOR sunlight to fully charge. "Sunlight through a window" generally takes five times as long, and indoor lighting is so dim in comparison that the chart won't even show how long it takes to get to "High" with an indoor light source.

gw2310 charging chart.png

The good news is that once the watch is fully charged, they can go for months without seeing the sun again.
 

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You appended your reply before I hit "submit." :-d

Yes, EVENTUALLY these batteries either won't fully charge to "high" or they won't stay there for long, but that shouldn't be an issue for many years or many charging cycles. The big problem with these batteries is if people leave them in the sock drawer on "low" or below for a long time -- these batteries seem to perform best when they're kept mostly charged.
 

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Just let it sit for a few days out in the direct sun. I do this with all my watches I buy new or used. Once they hit high, They stay out another full day 8+hours just to make sure they are topped off.
 

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Discussion Starter #6
Thanks guys, I'll make sure i leave it out a few more days, the sunlight at best is marginally better than a cloudy day in so cali so to be fair I will wait longer. I certainly will be wearing it daily. I do have other watches with metal bands like Citizen and others which I just don't wear b/c they pull on my arm hair and it is a shame to change their band but these resin style bands on the Gshock fit the style and the watch works well.

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once it's on high, all you need is like 8-15 minutes of sunlight a day to power the watch for the entire day and ambient lighting should be fine.
 

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Discussion Starter #9 (Edited)
I'm beginning to think the High mark is there as a tease. I have literally had the watch out in the sun and moved it every hour to make sure it is getting maximum sun exposure and angle for the past 5 days and it is still stuck on Med. Maybe i should just replace the battery, I just don't think this battery will charge to max capacity being the watch was produced in 2012 and sitting in a display case probably for the past few years. I assume replacing the battery is simple as unscrewing the back and swap? Will research the battery model as I'm sure it is less than standard CR 3.5v battery being rechargeable.

I should Note, I ended up keeping this model below. The size alone is what sold me over the 2300 model which was smaller. Any help with battery selection is appreciated.
GWX8900B-7
 

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Discussion Starter #10
I found this is the correct battery based on pacparts.com, I have also read some threads on here with these batteries failing. Information overload.

CTL1616
 

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Discussion Starter #12
Thanks Mike I appreciate it, I just did a search and found this below. I'm able to get the Tilt Test to pass but the Solar part does not show the 8888. Not sure if I'm doing something wrong, i put it in test mode under normal light than move it to the sun or block all light and no 8888

"Most solar G's are "smart" enough to use their solar cell to determine if a particular place or room is dark enough to activate the Auto EL, which helps save battery life. (This is also the reason why solar G's will stay in Auto EL mode for days or weeks, while non-solar G's automatically exit Auto EL mode after a few hours.)
With most solar G's, you can enter various "test modes" by pressing combinations of buttons simultaneously. On the GW-6900 you can get to the "solar panel test mode" screen by pressing A, B, and D simultaneously from normal timekeeping mode. That will bring up the letters "SLR" on the screen, and if you then move the watch into shadow or into brighter light, "8888" will appear below "SLR."
The "tilt sensor test mode" screen is accessed by pressing A, B, and C at the same time, and "TLT" will appear -- then tilting the watch will make "8888" appear and disappear as the watch is tilted.
From any test
mode, press any button to get back to normal timekeeping mode."
 

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In addition, a LOT of the "CTL 1616 failure" threads were from 2004 to 2007, shortly after Casio's solar powered watches first came out.

Apparently a lot of those first batteries were simply defective -- a couple of threads around here mention that Casio went back to their supplier, told them of the problem, and the problem got fixed! There really aren't many similar threads here from the past few years, which suggests that the newer solars DO in fact have better batteries.
 

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Discussion Starter #14
Mike can you please confirm, i was able to get SLR test to display 8888 only if i completely cover the watch so it is pitch black. If i take the watch into the sun or use a 1600 luman flashlight it does not display the 8888. Based on the test result i wonder if the solar plan is defective?
 

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Thanks Mike I appreciate it, I just did a search and found this below. I'm able to get the Tilt Test to pass but the Solar part does not show the 8888. Not sure if I'm doing something wrong, i put it in test mode under normal light than move it to the sun or block all light and no 8888
Since you've tried it both ways ("dark to bright" and "bright to dark") it sounds as though you're doing it right, and that there's a problem with the solar charging circuit, not the battery!

The good news (?) is that you shouldn't try to replace the battery, the bad news is that it sounds like your watch needs to go back to Casio for replacement or warranty repair. :-(
 

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Discussion Starter #16
Great brand new watch and its already defective, this makes sense why after all these days in the sun it didn't change. I'm really disappointed. It will certainly pass going from normal light to dark but not the other way around
 

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Mike can you please confirm, i was able to get SLR test to display 8888 only if i completely cover the watch so it is pitch black. If i take the watch into the sun or use a 1600 luman flashlight it does not display the 8888. Based on the test result i wonder if the solar plan is defective?
The solar panel is working A LITTLE if it can tell "pitch black" from some light.

The fact that the solar panel can't tell when it's in sun or the beam of 1600 lumen flashlight is a little worrisome -- I just tested three of my solars and they could sense the light from one compact fluorescent bulb in a table lamp.
 

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Discussion Starter #18
Thanks for the confirmation. I'm returning this and ordering a replacement right now. Wish i knew about these tests before spending the past 5 days leaving the watch in the sun lol
 

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Discussion Starter #19
Mike, i just took the GW2310FB (new watch) out the box to test as well to make sure I'm not doing something wrong. I'm getting the same result. I must be doing something wrong here. Can you tell me how you are exactly testing going from dark to light? I just went into my garage pitch black and put it in solar mode the moment i crack the door open it displays the 8888 but if i'm inside the house midday normal light no overhead lights on and I put it in Solar mode then move the watch directly in the sun or shine the flashlight on it it does not change. Could this be normal and its user error?
 

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Wish i knew about these tests before spending the past 5 days leaving the watch in the sun lol
Likewise, but as Tixtox's post on page 1 suggests, questions about charging and/or how long it takes to fully charge a solar G-Shock come up at least once a week around here, so it's very much the "hoofbeats and zebras" situation.

Defective solar cells happen a lot less frequently than that -- yours is only the second one I can recall reading about over three years of lurking on this forum. :-(
 
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