ClockThreejr LR2032 Battery

[Dman777]

I own the ClockThreeJr. It has this battery called LR2032
Coin Battery. I am having a hard time finding that exactly on the internet. Is that a rechargeable battery? I am only finding hits that show as rechargeable. 

If so, can anyone recommend a good brand? And is it easy to replace? I figure mine is so old it would be good to replace it. 

[Nicholas Stock]

I generally use CR2032 in my C3Jr and Chronogram. LR2032 is available on Amazon as far as I can see.

Nick

Sent from my iPhone

On Jul 12, 2024, at 18:39, Dman777 <darin....@gmail.com> wrote:

I own the ClockThreeJr. It has this battery called LR2032

Coin Battery. I am having a hard time finding that exactly on the internet. Is that a rechargeable battery? I am only finding hits that show as rechargeable. 

If so, can anyone recommend a good brand? And is it easy to replace? I figure mine is so old it would be good to replace it. 

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[J Forbes]

Perhaps LiR2032? which is a rechargeable lithium battery, vs non-rechargeable CR2032? Might want to do some more research

[Dman777]

Thank you very much. I love my clock, btw! It's one of my treasured items that could never be replaced.

Is it safe for me to use a normal CR2032 battery if the clock tries to recharge it? Also, I am thinking about putting the power on a auto timer and turning it off when I sleep. How fast would that drain the CR2032 battery?

[Mac Doktor]

On Jul 13, 2024, at 2:50 PM, Dman777 <darin....@gmail.com> wrote:

Is it safe for me to use a normal CR2032 battery if the clock tries to recharge it?

No, you'd have to put a diode in series to block the charging current. There may be a current limiting resistor that can be pulled out and replaced with the diode. This has the side effect of dropping the effective voltage by 0.6V so the battery will have to be replaced sooner.

Also, I am thinking about putting the power on a auto timer and turning it off when I sleep. How fast would that drain the CR2032 battery?

It will still take a while. A rechargeable battery has a lower capacity and shelf life.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"Every kid starts out as a natural-born scientist, and then we beat it out of them. A few trickle through the system with their wonder and enthusiasm for science intact."—Carl Sagan, Psychology Today, 1996

[Dman777]

> No, you'd have to put a diode in series to block the charging current. There may be a current limiting resistor that can be pulled out and replaced with the diode. This has the side effect of dropping the effective voltage by 0.6V so the battery will have to be replaced sooner.

In that case, is the LIR2032 battery same as LR2032 to use in the clock safely?

Thank you,

-Darin

[Adam Piórko]

From what I know, LR2032 and LiR2032 are the same. If a rechargeable battery (LR2032/LiR2032) is used in the system, the same type should be used. You cannot replace an LR2032 with a CR2032 and vice versa. The LR2032 has 3.6V and will discharge quickly without recharging, while the CR2032 is a regular battery with a nominal voltage of 3V. Regular batteries should not be recharged.

Adam

[Kevin A.]

"LR" denotes a rechargeable (secondary cell) chemistry. This should be a suitable brand name replacement for an LR2032: https://www.digikey.com/en/products/detail/RJD2032C1/6159135

[Darin Hensley]

Thank you very much. I love my clock, btw! It's one of my treasured items that could never be replaced. 

Is it safe for me to use a normal CR2032 battery if the clock tries to recharge it? Also, I am thinking about putting the power on a auto timer and turning it off when I sleep. How fast would that drain the CR2032 battery? 

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[Paolo Cravero]

On Tue, Jul 16, 2024 at 9:45 AM Darin Hensley <darin....@gmail.com> wrote:

Thank you very much. I love my clock, btw! It's one of my treasured items that could never be replaced. 

Is it safe for me to use a normal CR2032 battery if the clock tries to recharge it? Also, I am thinking about putting the power on a auto timer and turning it off when I sleep. How fast would that drain the CR2032 battery? 

NO. It is NOT safe to use a non-rechargable battery where a rechargable is supposed to be. Your clock is not a battery-powered device that you plug for recharging (or remove batteries and insert them in a charger). Your clock CONSTANTLY trickle charges the internal clock backup battery.

If you install a CR2032 in that device it will bulge, open up and leak chemicals causing permanent damage to your treasured item.

The good news. A L(i)R2032 will probably hold the charge for hours and you won't loose time settings overnight. The timekeeping chip does not need lots of power to keep counting and the battery will be topped up quickly as soon as power is restored.

Paolo

[Nick Andrews]

I've heard some say that the coin cells used on computer mobo last a decade or so because they get trickle charged when computer is on, but I've never seen anything but regular CR types in every computer I've built or scrapped.  But even sitting in the factory packaging, new cells don't seem to last that long, not that I've had one for 10 years!

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[Neil QQ]

I've used this site from time-to-time and found it helpful:

https://www.batteryequivalents.com/lithium-cr2032-dl2032-br2032-ml2032-lir2032-lr2032-batteries-equivalents-and-replacements.html

[Mac Doktor]

On Jul 16, 2024, at 10:06 AM, Nick Andrews <nickja...@gmail.com> wrote:

I've heard some say that the coin cells used on computer mobo last a decade or so because they get trickle charged

That must be an urban legend, although I wouldn't be surprised if someone actually tried it.

As Paolo said, NEVER try to charge a primary (single use) cell. You may get away with it for a while but eventually it will fail. That can be catastrophic.

when computer is on, but I've never seen anything but regular CR types in every computer I've built or scrapped.  But even sitting in the factory packaging, new cells don't seem to last that long, not that I've had one for 10 years!

I've routinely had them last longer than ten years just sitting in the machine. I have a 2008 iMac with the original coin cell. The old Macs used half-AA batteries and they lasted a long time as well. Note that Apple used brand-name batteries, not something ultra-cheap.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner

[Nick Andrews]

Yeah I always thought it was a myth, but...

Name brand, especially for rechargeables, is important.  For alkaline?  I like Energizer batteries myself.  From my caving days, they were always better than Duracell or others.  For random coin cells of course I've bought various random ones off Amazon, but the only ones that really last are name brand.  I've seen the same with the lithium AA, 9V, etc too.  I have yet to find a random lithium brand for AA that seem like an actual better deal than the Energizers.  For AAA, who knows as in my experience they all suck.

And for whatever reason, replacing SLA in small UPS doesn't seem worth it either.  They never seem to last very long!  With absurd shipping costs, you're almost better off just buying a new small UPS.  I know some have had success using Li-ion replacements for SLA, but that varies too based on personal experience.

We got a single Li-ion battery for our golf cart vs lead-acid.  It was about $1k vs around $800 for lead, but it weighs about 500# less.  Now that cart is FAST!

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[Nicholas Stock]

Here is the Github for the project..

https://github.com/wyolum/ClockTHREEjr/tree/master

And here is the PDF of the schematic.

As far as I can tell, there is no charging circuitry for a LR type coin cell, the 2032 is used as a battery back up for the RTC (DS3231).

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[andybiker]

This is not an urban legend. 

I worked in a computer manufacturer in the early 90s.

A supplier replaced the small Nicad pack on a "multi-IO/clock card" with a standard 2032 in a holder with hilarious results.

they seemed to work for a while, some bulged, some leaked, one went pop big-time !

[Mac Doktor]

On Jul 17, 2024, at 4:15 AM, andybiker <andy...@gmail.com> wrote:

This is not an urban legend. 

I can believe it.

I worked in a computer manufacturer in the early 90s. 

A supplier replaced the small Nicad pack on a "multi-IO/clock card" with a standard 2032 in a holder with hilarious results.

they seemed to work for a while, some bulged, some leaked, one went pop big-time !

Excellent. Any damage to the PC board or other components?

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

“...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980

[Nicholas Stock]

Darin,

Seeing as I was part of the WyoLum crew back in the day, I asked Anool, the designer of the electronics of C3Jr about the battery situation....

"The C3jr doesn't have a charging circuit for LR2032. We never planned on using rechargeable version as the normal 2032's last for over 5 years anyway"

So go ahead and use a CR2032.. :)

I have a few of the clocks for sale if anyone is interested..

https://stocksclocks.com/index.php/wyolum-word-clocks/

The Chronogram is one of my favorites... mine has kept pretty good time for the last 10 years or so and also handles DST automatically...

Cheers,

Nick

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[Dman777]

Hi Nicholas,

Thank you for the information. In the docs it shows a LR2023. I have not opened up the clock yet to verify the actual battery. If that is the case, why did they use a LR2032 battery which is, from my understanding, a rechargeable battery? 

Thank you,

-Darin

[Nicholas Stock]

That's a good question.... I see that in the original documentation too, probably a typo! I'll check with Justin....

Nick

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[Dman777]

Nick,

I am interested in buying some more clocks. I sent a email on the website. 

Thank you,

-Darin