PRAM battery for iMac 333MHz

I have be trying to upgrade a iMac 333 MHz from 8.6 to 9.2.2
I am up to 9.1 but need to connect to my dsl to do the 82MB download.
I have been moving the iMac around to different electrical outlets now the iMac will not start up.
The date and time each time went to 1956 so I am thinking it is the PRAM battery right?
Does anyone know the type of PRAM battery I need to replace? I do not have the manual or tech specs...
JTS

http://docs.info.apple.com/article.html?artnum=86181 Macintosh Family: Batteries and Part Numbers.
Radio Shack's battery# is 23-026. It is a 3.6V Lithium 850mAh1/2 "AA" battery made for Apple computers.
Mac 3.6 Volt Battery

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Directions for changing pram battery on imac DV

Hi,
A friend of mine has an imac 400 DV slot loader with a dead pram battery. I look after this computer for them but have never changed the battery on one of these. Can anyone give me directions and/or photos? I've had a look through older questions but the links all seem to be out of date.
Thanks,
James

This Macworld article has photos that illustrate removal of the bottom housing and EMI shield, to access the motherboard for upgrades. Some experienced users have been able to replace the battery, by accessing it through the memory door on the bottom. This involves the risk of letting it slip out of your fingers and then having to maneuver/tilt the iMac about, to remove the loose battery. Prior to removal, you should note the battery's orientation as to polarity (marked on the motherboard).

CMOS/PRAM battery for 15" MacbookPro 5, 3 (Mid June 2009)

Hey there!
What CMOS/PRAM battery I should purchase to replace the dead one in my MacbookPro5, 3 (Mid June 2009).
Thanks for any help!
- B

This article stops just short of your MacBook:
Apple Portables: Identifying the right battery--US
If your MacBook has a non-removeable main battery, it probably does not have a backup battery.

PRAM Battery for Powerbook G4 17" 1.33 problem

I have an Aluminum Powerbook G4 17" 1.33 GHz computer and need to replace the PRAM battery. This poses a problem. Typically they sell the PRAM battery/USB board as one replacement because the two rechargeable 3.7 v coin CGL 2430 batteries are spot welded & soldered to the USB board in parallel. The replacement part is 922-6064. When I look for a replacement, all I can find are used parts which mean that the batteries have a diminished life. Panasonic stopped making those batteries in 2005 and I can't find anything comparable. Even the places that advertise new parts say they only have used in the end. Next model up, the 1.5 GHz Apple made a battery pack that can be replaced. NewerTech makes that replacement. I would like to replace the batteries on my present USB board - new ones can be soldered or a plug can be added, but I have run into these problems. Those coin batteries are not available and I know the voltage, but not the amperage of those coin batteries that were used. NewerTech can't tell me the voltage/amperage of their battery pack for the newer version Powerbooks, so I don't know if jury-rigging one of those packs would work with my version of the Powerbook. I can't find Apple's specs anywhere for the voltage/amps that should go into the PRAM/USB boards in the 1.33 model and the 1.5GHz model so that I can figure how to do this repair modification. The USB boards for both models look the same, but I don't think that they are, but what is the difference? Anyone have an idea how I can do this modification to add PRAM power to my USB board?

Actually, this is a very minor problem, if the negligible incidence of posts here about replacement PRAM batteries dying is any indication. Apparently there are very, very few users of Powerbooks (going all the way back to the G3s of 1998-2001) whose use of these machines has outlasted a second PRAM battery. I still have a working 2003 Titanium Powerbook with its original PRAM battery in place, a working 1998 Powerbook G3 with its original PRAM battery in place, and a working 1997 Powerbook 1400C with its original PRAM battery in place. I doubt that new replacements are available for any of those batteries, but I wouldn't hesitate to buy used ones if I intended to use any of those computers for several more years. I suggest you go ahead and do the same, and install the used battery yourself to keep the cost down.
Message was edited by: eww

PRAM battery part number??

Hi, I need to buy a new PRAM battery and was wondering if anyone has a part number for it?

The PRAM battery for the computer listed in your system information is part 922-6007; for another type of Mac, check the information in the article I linked to.
(11863)

MacBook Pro PRAM battery? Or something else?

MacBook Pro 5,3
Intel Core 2 Duo 2.66 Ghz
MBP53.00AC.B03 1.48f2
Charge Information: Charge Remaining (mAh): 5628
Fully Charged:     Yes Charging:     No
Full Charge Capacity (mAh):     5698
Health Information: Cycle Count:     435 Condition: Normal Battery Installed:     Yes Amperage (mA):     0
Voltage (mV):     12447
Well the last thing that happened was rather odd.    I put in an SD card, and it wouldn't read it.     Then all of a sudden clicking on any of the drives or icons on the Dock wouldn't work.      The keyboard just froze in place.       I forced rebooted with the power button. It sat there spinning its sunflower on a gray Apple logo screen for over 10 minutes.   I tried zapping the PRAM to no avail, it sat there another ten minutes with the sunflower and didn't go anywhere.
I rebooted with command-S.    I did a /sbin/fsck -fy and /mount -uw / and the fsck process took about 5 minutes and it was happy again when I exited. The hard drive is only about 2/3rds full.    And now the SD card works fine.
So was the directory just messed up all along, and it just wouldn't read the SD card until fixed it?
Is there a firmware update for this machine?
Is there a PRAM battery for this machine?
Or is the main built-in battery just starting to die?
There is nothing funky installed. Just the plain Safari, LibreOffice, Firefox, and 10.7.3.
P.S. The mountain Lion in my signature is for another machine.

So was the directory just messed up all along, and it just wouldn't read the SD card until fixed it?
Is there a firmware update for this machine?
Is there a PRAM battery for this machine?
Or is the main built-in battery just starting to die?
Yes, I'd say the directory was messed up. I suggest you repeat the process of repairing the hard drive and permissions using Disk Utility. You will have to boot from an installer disc to repair the drive.
Yes. MacBook Pro EFI Firmware Update 1.7.
I do not know. I'm not sure whether Apple stopped using them by that model.
There's no evidence to suggest the battery is dying.

How do you change the pram battery on a slot loading iMac?

I'm hopeful that a new pram battery will solve the problems I've been having with my iMac. I just have to put it in, and judging by the correspondence I've seen on this subject, that's not an easy job. (One letter spoke of having to remove 16 screws) Does anyone know of a site that gives instructions complete with illustrations for changing the battery? It seems silly to have to take my set to a repair shop to change the battery, but I don't feel up to removing 16 screws without very clear instructions.

Hello,
So far, so good. My computer started after I changed
the battery, however, I can't be sure until tomorrow
morning because my set was still warm when I started
it. Tomorrow is the acid test. I'll let you, and
everyone else who has tried to help me, then.
Glad to hear that you survived, and that it seems to be working
Let us know what you find tomorrow.
A few comments: Whatever happens, this experience
will give me more courage for the future. I now know
that I can open my computer without breaking
anything--anything important, that is.
That's always a good thing
Possible problem: After putting in the new battery, I
noticed a loose black wire with a metal tip right
next to the battery.
Interesting...
The only thing I could think of that might look like that might be the Airport antenna.
But, it could be something else. Without pictures, it would be hard to really guess at it.
I hadn't noticed it before, so I
don't know if I might have accidentally unplugged it
from where it should be. Anyway, just to be sure, I
wrapped the metal tip with scotch tape to insulate it
in case it comes in contact with a metal part.
Was it attached to the logic board (the main circuit board which your battery was on)? Or, was it coming from somewhere inside the computer's case?
Any idea or description of where it's other end was attached?
I hate to tell you this now, but electrical tape would have been a better choice for insulating it. It's still possible for electrical current to pass through scotch-tape.
A small, white polyethene? part fell out during my
activities. I can only hope that it's not essential.
Without a description, it's hard to say what that might have been.
Does it look like a bracket? If so, it may have gone around one of the connectors around the CD-ROM drive connectors, or one of the other cables you disconnected.
Otherwise, if it doesn't appear to have a function, it might just be a piece of broken plastic.
If it's flat and rectangular, it could also be a cap that goes over the battery. But, those are usually black with a couple of tabs to hold it in-place.
Also, it looks like two small,flat, grayish tabs got
snapped off the bottom panel when I removed it.
That happens sometimes. I was fortunate with my system. I've opened it many times without breaking anything (yet).
I didn't find the job to be easy, but maybe that's
because I was stresed out during the whole operation.
Yes, that doesn't help.
Fear was the problem. I was afraid that I might touch
the wrong part, I was afraid that I might drop a
screw ito the computer, I was afraid that I was going
to break the bottom panel in the process of removing
it, etc. The most difficult step was replacing the
heat shield. For a while, I thought that I would have
to give up and just attach it as best I could.
Glad to hear it all went back together.
Hopefully the extra parts and cable were not important. I would feel better figuring out what they were if it were my machine. But, it's up to you if you want to delve back in there and try and figure it out.
Well, that's a summary of Niku's excellent adventure
in the computer repair world. Tomorrow I'll know if I
was successful. Wish me luck.
Thank you for the update. I hope all goes well and continues working for you.
Be sure to tell us what you find out in the morning.
Let us know if you have other questions.
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

Replace PRAM battery in in Intel core2 duo iMac?

I have just installed the iStat widget in my Intel Core2 Duo 2.16 Ghz iMac. I was a little surprised to see a battery level reading on it (of 45%). I wonder if it is measuring the remaining life of the PRAM battery. Remembering how badly my Powermac and my wife's G5 iMac behaved when their back-up batteries needed replacing, I want to avoid the same situation on my Intel iMac. However I can find nothing on Apple support for replacing the PRAM/back-up battery on an Intel iMac, so I am wondering if there is a replaceable battery or not. Anyone know?
Thanks
Wilson

From iSlayer Battery Section:
This section shows various information about your Mac’s battery. This section is only visible if you actually have a battery and won’t appear on desktops.
Percentage
The current battery charge as a percentage. This is also shown as a bar at the bottom of the section.
Time
Time left using the battery, time until charged, or “Charged” if the battery is fully charged.
Source
“AC” if the Mac is connected to mains power, or “Battery” if the battery is being used.
Status
This shows if the battery is charged, charging or draining.
Battery Health
This is a comparison between your current battery capacity and capacity of it when it was new. For example, if your battery lasted 5 hours when it was new, a figure of 50% suggests you should get 2.5 hours out of your battery now.
Cycles
The amount of battery “cycles” the battery has had. One cycle is defined as a complete discharge and charge of the battery, but partial discharge and charges also count. So, two half discharge and charges are the same as one complete discharge.
For some tips on how to get the most out of your laptop’s battery, please visit this Apple support page.
Message was edited by: lakewoodlawnman

PRAM battery reset or similar for PowerBook G3 400MHz Lombard

Hello,
I recently acquired a PowerBook G3 400MHz Lombard? (not pismo)- with the battery dead and it not getting any signs of life beyond a green light on the display or the caps-lock. I was wondering if there is a simple fix that might get this going, similar to removing the PRAM battery on a Pismo that has been sitting there til the batteries drained. Any help would be appreciated so I'm headed in the right direction on this.
Thanks.
-m

Hi jpl,
First let me say a big thank you for such a prompt response. I love this place because of participants like you... thanks.
You have a Powerbook G4 in your profile; if you do
not have the Powerbook G3 Series Bronze Keyboard, the
following does not apply. If you have a G4, head over
to this forum:
http://discussions.apple.com/category.jspa?categoryID=
124
Sorry for any confusion. I indeed have a G3 Lombard with the bronze keyboard (Got it in 1999). I then upgraded to the G4 about 3.5 years ago. And just last week I got me a shiny new intel iMac.
The Lombard is currently running Jaguar, but its gotten sluggish and has run out of space (original specs). I want to reinstall OS 9, but I have this current issue with starting it up.
Generally, if the powerbook does boot up, even
occasionally, you do not have a corrupted power
manager. The procedure you quote is for a powerbook
that does not start at all, even after a normal power
manager reset, and this usually occurs when a 'book
has been unused for a few months...this allows the
batteries to run flat and corrupt the power manager.
Unlike desktop computers, powerbooks can run fine
with a dead backup battery.
The computer is being used almost daily...
I would look first at other potential problems...
- Do you have a working main battery?
No.
- Once the 'book is running, does it perform
normally? Can you sleep/wake the 'book and also
perform a restart?
Once it's running it performs normally. I can sleep and wake. I CANNOT perform a restart.
- Once running, open the System Profiler >
Memory...does it report either 512K or 1MB of L2
cache?
My 'book is at home currently... I will check when I get home.
- When shut down, remove the main battery and optical
drive. With the power adapter connected, press the
reset button on the back panel to reset the power
manager, wait 5 seconds, then press the power button.
Does it •always• start normally from a cold start
when following this procedure?
I want to say no, but I will double check this as well when I get home.
Thanks again for your help!

How to replace an PRAM battery?? IMac g3 9.1 "Bondi Blue"

I think that my PRAM battery is dead. Can anyone give me instructions to replace it? I have a full working battery from an older computer lying around somewhere...

Hi, Ben -
Replacing the battery in early iMacs can be tricky. You would probably get a quicker directed response if you reposted this question in one of the hardware forums for the iMac G3 models. The most appropriate would probably be this one, the Using your iMac G3 (CRT) forum -
http://discussions.apple.com/forum.jspa?forumID=888
Not all computers use the same battery. This Apple KBase article cross references battery part numbers with models -
http://support.apple.com/kb/TA21569

Dead iMac G3 suddenly won't power on. PRAM battery or Power Supply?

iMac G3 350 slot load USB only running 10.4.11
i love this little guy.
it's been running almost non stop for a few years as a file server... only restarted maybe a dozen times during that period. i can't remember ever shutting it down.
i had to move it recently. might have been unplugged from a wall socket for a minute or so. plugged it back in but left it powered off for a few days.
went to turn it on recently and nothing. not a chime, not a light, not a click or hard drive spin-up. zero. pushed the PMU reset button once. still nothing. i've taken the PRAM battery out for now.
my question is this: is it possible the power supply is dead and a PRAM battery will not fix the iMac? is there any way to tell before spending money on a new battery i may not need?
thanks!

Hello Nicholas,
I recently retired my hard working 350 slot so I know how great the computer can be.
Unplugging for a moment should not have affected the battery.
I would respectfully suggest you start with the simple things such as:
1. - Make certain the power source is not on a switch and that it is good
2. - Be certain the power chord is fully seated in the back of the computer and wall socket.
3. - If trying to start from the keyboard button, try using the button on the face of the computer
perhaps the keyboard is not fully plugged into the usb port.
I always like to start with the simple things when I have a problem.
Now that the battery is removed it could cause a bit of a problem. I think I would install the battery
and check the above mentioned ideas. If still no power, then I would replace the battery.
It doesn;t seem logical that the power supply would just go as a result of the board.
I would try to get the computer up and running.
One last tip.......when my slot load was starting to go it acted odd. I would let the computer sit for a day or two and it would then start. It was irratic at best but the old computer allowed me a few last
boots so that I could back up to my external.
It is a great computer and sounds like it served you well it deserves a few chances.
I hope you replace the battery, plug and it re-starts. Keep it plugged in once the battery is replaced/returned .....Best of Luck Jim

Intel iMac PRAM battery replacement

Can anyone point me at some instructions for replacing the PRAM battery in an early intel iMac please?

It is a coin battery, 3 V Lithium (922-6476), and requires opening the case to get to it. I cannot find a teardown photo sequence that shows how to replace it. Nor do I find the battery pointed out in any of the tears downs available at ifixit.com.
http://www.ifixit.com/Guide/Device/iMacIntel17%22
Dah•veed

6400 PowerPc Performa Pram Battery issues - remove for storage?

Hello,
I have a 6400 that I want to use, primarily for storage of some older files, which I've now transferred onto it.
The unit obviously has a weak 4.5 volt alkaline Pram Battery as the Clock reverts to 1956 when is unplugged overnight.
My specific question is:
With all these vintage Performa's, will they work correctly and consistantly WITHOUT a Pram battery in them at all? (Realizing that the time must be set each time up).
I know WITH a weak Pram Battery random things begin to happen, and video can even be lost. My thinking for long term storage of an old unit would be to remove a weak battery before random problems degrade the unit.
Hence to iterate, will these units maintain the factory settings better and more consistantly WITHOUT a battery than with a Weak one, not losing the ability to come up.
Lowell

Jeff,
Thanks on your 64/6500's. I'm going to do just that.
My question was partly technical curiosity in that I've seen and read dozens of problematic symptoms from bad or weak batteries, and none of the answers ever said JUST TAKE
them out and leave them out until . . .
On that basis, I still can't quite figure out how all that relates to CUDA resets on a unit with problems. On most Performa's the board must be out to reset CUDA, and it would seem that the board would need power to reset?? (I'm speaking of a unit that is down, perhaps with a question mark or no hard drive showing, etc.) I'll keep reading.
FYI, I did make a battery pack fm 3 aa batteries for the 6360. Found one really interesting tidbit on AppleFritters, saying also that a 9 Volt battery has two 4.5's inside, and one guy used ONE of those.
Lowell
I removed the batteries from my retired 6400s and
6500s, primarily to prevent leakage (as Grant has
mentioned). I've seen the corrosive damage to
motherboards, caused by leaking alkaline solution
from those batteries. When I periodically start up
the 6400/6500s, I reset the date & time so that any
file modifications have the correct information.
Other than that inconvenience, the computers
function normally.

Battery for PRAM ?

Is there a battery for PRAM inside the Mac Pro just like the Power Mac G5?

http://support.apple.com/specs/macpro/Mac_Pro.html
Developer Note good to know but makes no mention.
Batteries:
http://docs.info.apple.com/article.html?artnum=86181
http://www.apple.com/support/macpro/
http://manuals.info.apple.com/en/MacProBatteryDIY.pdf

Voltage range of battery charger for iMac accessories?

Is the US-sold battery charger (for iMac accessories with two batteries charged at once) working from 110 to 230 volts (with US-plug though)? Thanks.
Pierre

Since the charger is rated at 5 Watts, and you have 5 Watts there that should work.

PRAM battery for iMac 333MHz

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