Battery Difference between CR2032 and CR2025

[Sjouke Burry]

[email protected] wrote in

My computer clock battery died. It had a CR2032. I bought a CR2025 at
a store going out of business (No Returns). Both say they are 3v. The
CR2025 is a little thinner, but otherwise they are the same size. Is
there any reason not to use the 2025?

To thin to fit in quite a few sockets.
And if it fits a bit, it will be empty much sooner.

 

[[email protected]]

My computer clock battery died. It had a CR2032. I bought a CR2025 at
a store going out of business (No Returns). Both say they are 3v. The
CR2025 is a little thinner, but otherwise they are the same size. Is
there any reason not to use the 2025?

--------------

 

[Jamie]

My computer clock battery died. It had a CR2032. I bought a CR2025 at
a store going out of business (No Returns). Both say they are 3v. The
CR2025 is a little thinner, but otherwise they are the same size. Is
there any reason not to use the 2025?

They are the same except that the 25 is lower amp rating. The
25 at the end is 2.5mm verses the 3.2 mm you were using.. It'll
work just fine but not last as long. Probably it'll last long enough
for the rest of that computer's life.

the 20 at the start is the width of the cell.

I am doing this from memory but it should be correct.

Jamie.

 

[[email protected]]

My computer clock battery died. It had a CR2032. I bought a CR2025 at
a store going out of business (No Returns). Both say they are 3v. The
CR2025 is a little thinner, but otherwise they are the same size. Is
there any reason not to use the 2025?

No.

 

[hamilton]

My computer clock battery died. It had a CR2032. I bought a CR2025 at
a store going out of business (No Returns). Both say they are 3v. The
CR2025 is a little thinner, but otherwise they are the same size. Is
there any reason not to use the 2025?

Google knows:

http://en.wikipedia.org/wiki/List_of_battery_sizes
(2/3s down the page)

~2/3 the Capacity and smaller

 

[Jamie]

Yep that's correct.

For a 2032, the 20 means the diameter (20mm) and the 32 means the thickness
(3.2mm). The 2025 is 2.5mm thick and the even thinner 2016 is 1.6mm thick.

Most sockets are designed for a particular thickness so as others have
noted, the 2025 will not fit the socket correctly.

Regards,
Simon.

That is not totally true..

Many sockets don't use the swing over spring arm, the cell is wedged in
the socket via a side spring to hold it. This means it'll hold all the
CR20xx sizes.. Your key FOB on most cars are a good example. At least
the one on my jeep and Sante Fe are.

Jamie

 

[[email protected]]

Yep that's correct.

For a 2032, the 20 means the diameter (20mm) and the 32 means the thickness
(3.2mm). The 2025 is 2.5mm thick and the even thinner 2016 is 1.6mm thick.

Most sockets are designed for a particular thickness so as others have
noted, the 2025 will not fit the socket correctly.

Regards,
Simon.

It's contacting fine, and is working to keep my clock set. Teh contacts
are on the side of the case part of the battery, so it seems to work
just fine. This is an older IBM computer, and it needs a new battery
every 8 months or so. It always has since I bought it around 2004.
Seems that IBM computers all had (or still have) this problem. I'll
live with it. At least they dont seem to have failing capacitors and
the other failures that some other brands are known to have. Aside from
eating batteries, these IBM systems seem to run forever.

I should mention that I always shut off a power strip for the computer
and all components hooked to it. I was told that leaving it plugged in
and just shutting off the power switch would save batteries. But I'd
probably pay for it in my electric bill, and possibly lose a computer
from lightning. Lightning strikes are common on farms. I tend to lose
a modem at least once a year and recently lost a DTV converter. I'd
have to disconnect the antennas and phone lines and darn near everything
else to prevent this. That gets to be a major hassle.

 

[spamtrap1888]

It's contacting fine, and is working to keep my clock set.  Teh contacts
are on the side of the case part of the battery, so it seems to work
just fine.  This is an older IBM computer, and it needs a new battery
every 8 months or so.  It always has since I bought it around 2004.
Seems that IBM computers all had (or still have) this problem.  I'll
live with it.  At least they dont seem to have failing capacitors and
the other failures that some other brands are known to have.  Aside from
eating batteries, these IBM systems seem to run forever.

I should mention that I always shut off a power strip for the computer
and all components hooked to it.  I was told that leaving it plugged in
and just shutting off the power switch would save batteries.

Yes, you are discharging the battery every time you shut off the
computer. But what's the problem? You just have to reset the time
every time you boot.

 But I'd
probably pay for it in my electric bill, and possibly lose a computer
from lightning.  Lightning strikes are common on farms.  I tend to lose
a modem at least once a year and recently lost a DTV converter.  I'd
have to disconnect the antennas and phone lines and darn near everything
else to prevent this.  That gets to be a major hassle.

Get a UPS that offers adequate surge protection.

 

[[email protected]]

On Monday, September 10, 2012 10:23:27 PM UTC-4, (unknown) wrote:
I was told that leaving it plugged in and just shutting off the power switch would save batteries.

Battery life expectancy is determined by 'shelf life'. Typically five years. The battery will discharge just as quickly on a shelf or in that computer (assuming an IC that contains the CMOS was properly constructed).

 

[[email protected]]

   Bullshit.  The computers RTC isn't static, it consumes some power at
all times.  When the computer isn't supplying the power, the battery
is.  It isn't much, but it will cut the battery life by half. The RTC
uses the same 32,768 hz crystal used in a digital watch, and the same
divider chain to generate the 1 PPS, followed by additional dividers to
track time & date.  it also has additional registers to store BIOS
settings.  No CMOS circuit is perfect.  All gates leak small amounts of
current, and the more a chip has, the more it consumes due to leakage.

but it isn't much for something specially made for low current

I just picked the first maxim rtc on their list
http://datasheets.maximintegrated.com/en/ds/DS1339A.pdf
something like 0.5uA

looking at this: http://www.sony.net/Products/MicroBattery/cr/spec.html
it doesn't seem to make much of a difference for a cr2025/cr2032


-Lasse

 

[[email protected]]

. it doesn't seem to make much of a difference for a cr2025/cr2032

IC consumes so little current (nanoamps) that battery shelf life is the relevant parameter. Either battery should be good for at least five years as demonstrated by correct numbers (in nanoamps; not microamps).