Citizen Aqualand battery - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-21-2013, 07:25 PM   #1 (permalink)
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Default Citizen Aqualand battery

I just received a Citizen Aqualand CO21, movement is not working.

I opened it up, removed the old batteries, cleaned the contacts and went to insert new batteries. New batteries won't fit, too thick.

I previously turned up an owners manual on line for the watch which said batteries should be no. SR927W. Battery cross reference chart show this to be also known as number 399, a 1.5 volt silver oxide battery with a diameter of 9.5 and thickness of 2.7. This is what I tried to install, too thick.

The old batteries were stamped "AG6 ... Tianqui ... Alkaline cell." Battery cross reference chart show this to be also known as number 370 or SR920W, a 1.5 volt silver oxide battery with a diameter of 9.5 and thickness of 2.0.

Off to buy more batteries I find silver oxide 1.5 volt cells labeled "370/371." What is the difference between the 370 and 371? Does this movement require low drain or high drain batteries?

Assistance greatly appreciated.
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Old 10-23-2013, 11:27 AM   #2 (permalink)
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SR920W or 370/371 are the batteries you want. This movement does take high-drain batteries. 370 is high-drain whilst 371 is low-drain. Both will work ok in the watch; the only real difference is that the high-drain battery will outlast the low-drain variety.

However, believe it or not, battery manufacturers have now managed to produce both high and low-drain versions in the one battery (370/371)! Don't ask me how they've done it, but they have. It's all a matter of the battery chemistry, apparently. So SR920W or 370/371 -- the choice is yours.
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Old 10-23-2013, 03:53 PM   #3 (permalink)
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Default Thanks, Sir Les!

Information is much appreciated.
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Old 10-23-2013, 04:48 PM   #4 (permalink)
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I've just sent my vintage Aqualand CO23 in at my Citizen Authorized service center in my city, for the 3 batteries replacement and relube the gaskets w/ pressure test.

So I've here in my hands the original batteries replaced, and the original package from where the new ones were taken off for use at Citizen:

SONY 371 - SR920SW - Silver Oxide 1.55V

Hope this helps.
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Old 10-23-2013, 09:25 PM   #5 (permalink)
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ok......so since this issue came up, I`m curious what are the 3 batteries for? I know, from what I was reading that, one battery is dedicated for the depth sensor. What about the other 2? One for the LCD display and the other for the analog part?
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Old 10-24-2013, 08:34 AM   #6 (permalink)
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ok......so since this issue came up, I`m curious what are the 3 batteries for? I know, from what I was reading that, one battery is dedicated for the depth sensor. What about the other 2? One for the LCD display and the other for the analog part?
Exactly.

That's a silly engineering compromise (IMO) that Citizen has finally addressed upon releasing the JP200X-YY series (the reissued classic models in silver and two-tone versions). The new module C520 concentrates all the 03 functions taking up just one single, large lithium (?) battery.

Sir Les, could you please confirm if the reissue model takes a lithium battery - it sure is a large one just like the lithium ones.
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Old 10-25-2013, 09:30 AM   #7 (permalink)
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Yup -- lithium alright -- CR2016.
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Old 10-25-2013, 06:14 PM   #8 (permalink)
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Ok. So the digital and analog part are running on independent batteries. Does that mean they are independent from each other? Meaning that they don`t run off the same chip? I`m asking this because I perfectly synchronized the digital and analog timekeeping and so far, for the past month, they are still running perfectly in sync. I had before analog watches with digital display and after a while they were usually out of synch
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Old 10-26-2013, 12:09 PM   #9 (permalink)
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Ok. So the digital and analog part are running on independent batteries. Does that mean they are independent from each other? Meaning that they don`t run off the same chip? I`m asking this because I perfectly synchronized the digital and analog timekeeping and so far, for the past month, they are still running perfectly in sync. I had before analog watches with digital display and after a while they were usually out of synch

If you let the digital batt only die, the analogue part will keep on ticking. Vice-versa is also truth.

As for the depth meter, if you also let the digi batt die, the depth meter will remain active, but not useful, since you won't have a panel to read the depth readings.
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Old 10-26-2013, 01:22 PM   #10 (permalink)
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If you let the digital batt only die, the analogue part will keep on ticking. Vice-versa is also truth.

As for the depth meter, if you also let the digi batt die, the depth meter will remain active, but not useful, since you won't have a panel to read the depth readings.
Thanks. It certainly is interesting the way it was designed to work and each battery supports certain functions. I suppose there is an advantage of running off multiple batteries. No matter which battery dies first (LCD or analog) the other will still run. Its highly unlikely that both digital an analog will die at the same time...
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Old 10-26-2013, 03:30 PM   #11 (permalink)
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Thanks. It certainly is interesting the way it was designed to work and each battery supports certain functions. I suppose there is an advantage of running off multiple batteries. No matter which battery dies first (LCD or analog) the other will still run. Its highly unlikely that both digital an analog will die at the same time...
Regardless, this is one serious tool dive watch. Be it the vintage classic or the reissue classic, this has to be one of the toughest mofo watches for diver's ever launched.

You see everywhere and left to right people raving about the 6309-7040... well, I think the aqualand is just as tough - if not tougher - as the 6309 is, and curiously an underrated dive watch by comparison, be it the price it ends up fetching in comparison to the Seiko, be it for desirebility. At least that's what it seems to be, IMO.
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Old 10-27-2013, 11:32 AM   #12 (permalink)
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Regardless, this is one serious tool dive watch. Be it the vintage classic or the reissue classic, this has to be one of the toughest mofo watches for diver's ever launched.

You see everywhere and left to right people raving about the 6309-7040... well, I think the aqualand is just as tough - if not tougher - as the 6309 is, and curiously an underrated dive watch by comparison, be it the price it ends up fetching in comparison to the Seiko, be it for desirebility. At least that's what it seems to be, IMO.
You are right, popularity always leads to over/under rating. The 6309 obviously got popular for a reason but it is also that popularity that gives the watch its (over) rating. And that`s when supply and demand comes in .... Its popular but its not being made anymore so everyone wants it.... result? High(er) price.
Aqualand its always been one of my favorites... maybe because it looks different than other divers...or maybe because it is not THAT popular which also makes it more affordable.
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Old 10-27-2013, 01:05 PM   #13 (permalink)
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Quote:
Originally Posted by Chris Galbraith View Post
Regardless, this is one serious tool dive watch. Be it the vintage classic or the reissue classic, this has to be one of the toughest mofo watches for diver's ever launched.

You see everywhere and left to right people raving about the 6309-7040... well, I think the aqualand is just as tough - if not tougher - as the 6309 is, and curiously an underrated dive watch by comparison, be it the price it ends up fetching in comparison to the Seiko, be it for desirebility. At least that's what it seems to be, IMO.
I really wanted to add a quartz diver (specifically ana-digi) to my collection a classic Aqualand would be at the top of the list (reissue more likely than original). Obviously if it were analog only quartz it would be a Tuna!
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Old 10-28-2013, 10:26 AM   #14 (permalink)
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Quote:
Originally Posted by LES2900 View Post
Ok. So the digital and analog part are running on independent batteries. Does that mean they are independent from each other? Meaning that they don`t run off the same chip? I`m asking this because I perfectly synchronized the digital and analog timekeeping and so far, for the past month, they are still running perfectly in sync. I had before analog watches with digital display and after a while they were usually out of synch
I believe they run off the same timing circuit, as mine keep in perfect synch as well. If there were two timing circuits, there would be a gradual drifting apart. Another reason to love the Aqualand!
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