Casio CTL1616 001616 – Watch Accessories

I got this for a Casio G-Shock GW-M850 that is now around 13 years old, it works perfectly appeared to be fully charged already after I installed it, the CTL1616F was and is the exact same battery/capacitor that came out of the watch. The only reason I had to get this is that I think I cooked the original battery by leaving the watch unused at the window for a long time the watch probably overheated and ruined the battery, apart from that the original battery had worked perfectly for the 13 years I've owned this watch so the new one should work at least that long or longer. The symptom was that although the watch still worked and the power indicator was still at H (full) any time I used the backlight the L M H indicator would start flashing and the backlight basically didn't work any more. After replacing with this new capacitor/battery the watch is working perfectly again and the backlight is great. Just make sure that if your watch is a solar powered watch that you get the Panasonic CTL1616F this Casio item is the Panasonic CTL1616F it's the F that's important. Pictures show the watch with the new supplied battery, my backlight now working and the old battery which I removed from the watch the new one was identical to the old one. The last picture is the watch case being opened I would recommend that you get a new seal is you are doing this with a G-Shock as you'll probably forget at some point that you've opened it up and your 200m water resist will not longer be valid I cleaned all the years of sweat and gunk from mine and from the strap as well as replacing the gasket and hopefully my watch is still good for its 200m water resistance. The Casio part number for the gasket is product code: 10237046 if anyone has a similar model, the o-ring fits multiple G-Shock models.

After more than ten years, the battery in my Casio ProTrek PRW-1500 solar powered watch was not charging as it should and not giving enough power to provide full functionality despite showing an H [High] symbol. After much research I found this was the required battery and made the purchase. You will need a few special tools to get into the watch and perform the change [small cross-head screwdriver (to open/remove back plate), a pin (to release battery clip), plastic tweezers (to handle battery), needlepoint metal tweezers (to reset after battery change)], but the procedure is fairly straightforward, if but a little fiddly. N.B. Be careful not to remove or lose the tiny springs that are in the body of the watch, nor of course the screws you have removed. After battery replacement, ensure body of watch is seated well and that the spring loaded buttons are in position. One may need to gently prise back the spring on the body to get it to sit in the correct position behind the button. After changing the battery, resetting and replacing the back there is an unnerving wait as the watch appears, at first, to be non functioning. The C [Charging only] flashes and the time begins at 12:00 on 1/1/2008. However after a few minutes in bright sunlight, it was soon showing an M [Medium charge] whereupon one can go ahead and adjust the watch to the correct time, recalibrate the altimeter, compass etc. The R/C [radio-control] time reception kicked-in automatically soon thereafter but failed to set the watch to the correct time, but overnight did finally update. While there are a few LCD elements that have partially failed after 12 years, there's still some life in this watch yet. And for £11 to restore its full functionality for another few years, this was definitely a worthwhile purchase. After all, a new equivalent Casio ProTrek can cost in the region of £300+. So all in all a good product and reasonably priced. But perhaps only for individuals adept at repairing fiddly, small and tricky items.

Perfect exactly the same as genuine one (I took out after nine years)

works well

When this turned up I set about putting it in my waveceptor straight away. The battery had been failing for a while and I had turned off the hourly signal and automatic update to eak a bit more out of it - should have replaced it months ago. I had updated the watch every few days under a bright light - which usually worked, but is obviously not a long term solution. Anyway, I had read the reviews that mentioned the 3 springs and i still managed to drop one of them twice - down on the carpet looking for something that small was a pain, but fortunately successful. I got the watch back together, not forgetting to short the battery out for a couple of seconds and it didn't want to work. The LCD display was showing and I was able to manually change the time, but that was it. On the window sill for a few minutes - nothing. I was concerned that I had done something wrong - but I walked out of the building into the bright sunshine and within a minute all was working brilliantly. The anaolgue hands were not the same as the digital and I had to manually adjust - but I now have everything working on my watch as if new (it's not new, it getting fairly tatty, but that is the poor design of the watch) and 24 hours after fitting it has updated overnight and is deadly accurate as it used to be. I used silicone grease on the seal.

Used as replacement for OEM battery in a Casio Solar Pro-Trek. Does it's job...

Arrived dead and wouldn't charge, returned for refund

I would suggest watching a few videos on you tube for CASIO watches as you need to do a reset by connecting two parts of the watch. Easy when you know how, and have found your glasses. It varies from watch to watch too.