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T520 HELP! Will not turn on unless CMOS battery is...

Q: T520 HELP! Will not turn on unless CMOS battery is...

T520 i7The Problem: Machine will not turn on when button is pushed.Steps Taken: New motherboard installed. Machine started up just fine. Turned it off and it would not power up when button was pushed. I unplugged the CMOS battery(the little watch battery) and plugged it back in and the power button works once again. Turn it off again and again it will not power up. If I leave the CMOS battery unplugged, then I can restart the machine, but only after I unplug the power cord and plug it back in; kind of like a reset between each poweroff/power on cycle. If laptop battery is inserted, it will not power on no matter what I do. It will only power on with the power cord. Laptop Battery checks out fine. I tried a new CMOS battery as well.Solution???

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RELEVANCY SCORE 200
Preferred Solution: T520 HELP! Will not turn on unless CMOS battery is...

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RELEVANCY SCORE 70.4

Recently in the process of upgrading my Dell laptop the plastic cover of the CMOS battery broke off. I held the battery back into the casing with a sticker tape. The system worked fine until I took the laptop to work some weeks after. At work I pressed the power button to turn on the laptop, but it wont turn on. Absolutely no sign of power to the system; no power led, no sound or feeling at all. When I noticed some noise inside the laptop, I opened it and behold the button CMOS battery was no more in place.

I got back home and I fixed the tiny plastic that holds the battery to the casing with a little epoxy adhesive, and used the opportunity to replace a new battery. After coupling the machine back the condition remained the same. Any assistance from this great forum would be appreciated to be able to get my laptop up and running again. Thank you all in advance.

The Laptop is: Dell Inspiron 1501, 2GB RAM, 2ghz speed processor, Win 7 installed. I have no reason to suspect the power pack, everything looks fine.
 

A:My Dell Laptop fails to turn on after change of CMOS battery.

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RELEVANCY SCORE 61.2

After my friend's laptop wouldn't run on battery power OR charge the battery I tried many "fixes."
 
Shockingly none worked that I found.
 
Only one thing worked for me to my surprise.
 
A last ditch effort was to open up the laptop (sony pcg-81114L) and disconnect the cmos battery for a few minutes to reset the CMOS.
 
To my surprise, when powered on, the battery instantly showed it was charging AND when removing the power plug the battery POWERS the laptop now! (and I'd thought I was wasting my time.)
 
Worked with an off brand battery also.
 
Many times this has saved many computers that have odd "unsolvable" things wrong with them.
 
Surely someone else has done this also but I haven't seen it posted anywhere to my knowledge.
 
Thank GOD for bringing the idea to remembrance!

A:sony vaio won't charge battery or run on battery power (CMOS BATTERY FIX!)

Hi askfault,
Do you have any information on how this fixes the battery problem? would be interested to know.
 
Xen

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RELEVANCY SCORE 57.6

Hello everyone,
I have been having a problem with my laptop recently. A few weeks ago my laptop turned off, and wouldn't turn back on. I did some googling, and found suggestions to remove the memory, SSD, and CMOS battery, wait, then put them  back in and try again. When I did that, it didn't work the first few power button presses, but then it turned on. It has been consistent like that. I have the battery out, and on AC only, when I remove AC and CMOS battery, then plug the AC back in, the laptop will boot after hitting the power button a few times.

Any suggestions?

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RELEVANCY SCORE 57.2

I guess this is a very old thread, but I am having the same problem with my ThinkPad T520.
The battery is fine, but it will not power the laptop. I'm thinking it may be a pico fuse on the motherboard.
Turning the laptop off for a few minutes as suggested does not work. Taking the battery out and pushing the power button for 30 seconds does not work. Buying a new battery just because Lenovo says my old one is dead does not work for me.
Anyone else having similar problems?
 
Moderator note: post moved from 6-year-old B & G thread to T series forum for visibility.  Subject edited to match content.  Was:  Re: Reset Surge Protector on Motherboard - PLEASE HELP

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RELEVANCY SCORE 57.2

Unexpected shutdown, no bsod, no warning. Only happens without AC (battery only). I thought it was a bad or damaged battery, so bought a new one. Worked better for a couple days, now back to sudden shutdowns, nothing in the event viewer. Won't boot with battery only after shutdown, need AC to get started again. Older model, bought maybe in 2011.Current thoughts : - damaged/loose battery connection- failing cmos (no other signs, wifi has been flakey though)- failing mobo- other failing hardware ?before I invest any more money in this laptop I'd like to try to identify the real issue. 

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RELEVANCY SCORE 56.8

I have just replaced my CMOS/BIOS battery today, as , I have faced some critical problem regarding regular BIOS date/time reset after system shutdown. But I want to know how do i recognize, that my new batter is totally ok or functional.

Battery Meter gadget shows that "battery Not charging"
Is it a gadget problem?

Is there any method available so that I can track that my new installed CMOS battery in PC is working fine?

Please help me.

A:Battery Meter shows CMOS battery not charging

The battery you have replaced is solely there to maintain the clock and other BIOS settings (if you have changed them from their defaults). It will not prevent you from booting your system if it is dead/missing; all it means is that you will have to enter the BIOS each time and make the correct settings and time. This battery is not rechargeable.

Do you still have to enter the correct time, or is the BIOS maintaining this now you've changed the battery?

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RELEVANCY SCORE 56.8

Been working fine until a few days ago. When I turn it on it says 163 - Time and Date not set - There is no option in bios to set date Non-System disk or disk error replace and strike any key when ready - Bios cannot detect hard drive So the question is if the RTC Battery is weak or dead can it cause above issues Thanks Chris

A:Question about RTC Battery (CMOS Battery) and System Errors

CWILLIAM83 Hello;Allow me to welcome you to the HP forums!The answer is actually -- yes and no. A weak or dead CMOS battery will prevent the BIOS settings from being saved when you power off the PC. If the default settings work OK with your hardware, then the only thing you would notice is that the clock resets. But, if you customized your settings to see the hard drive, then the default settings might not see it. After you replace the battery, you would have to go through configuring the settings-- again.Good Luck

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RELEVANCY SCORE 56.4

I tried to install a battery  update on my Lenovo T520.  The update fails with an "internal error" message being reported.  The battery does not fully charge and now lasts only a few minutes once the charger is unplugged.  The battery is a Lenovo replacement less then a year old.

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RELEVANCY SCORE 56.4

Hi,I have this weird problem with my battery indicator. It doesn't work, shows gray battery and three dashes inside instead of the remaining time. The system (Windows 7) built-in indicator works properly however. When I open the Power Manager, it shows some random, impossibly high number of watts used. Each time I open the power manager, the value is completely different.  I haven't installed/updated anything recently, yet a few days ago when I've started the system, the battery indicator stopped working. Restarting the system doesn't help. What do I do now?

A:T520 Battery indicator doesn't work

Hi Migajek,
 
Welcome to Lenovo Community! And happy to have you here.
 
As I understand that you are facing issue Lenovo Power Manager which is not showing battery status in your T520
Please have a look on the following article
 
Do let us know how it goes.
 
Cheers
Prabhansh_______________________________________________Tap that Kudos button if I helped.If you find a post helpful and it answers your question, please mark it as an "Accepted Solution"!

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RELEVANCY SCORE 56

I have a new battery on order.  But its a windows issue, not a battery issue.  Im currently attempting to upgrade the bios but the bios utility WINUPTP won't let me do it because my battery level is not detected.  I tried modifing the winflash ini file to not check for the battery.  That works but I get a message that the bios is not newer when trying to update with one of the files extended .FL1
:
[Power]AC=1Battery=1BatteryLifePercent=0
 

So I tred to run WinUPTP instead.  It is aware of the Bios difference but complains about the battery level:
 
OS = Windows 10 64bitDriver Loading....DoneSystem BIOS Version -> 8AET41WWApplying BIOS Version -> 8AET69WWSystem EC Version -> 8AHT27WWApplying EC Version -> 8AHT42WWAC adapter/Battery check....Failed.Error : Your battery needs to be charged to avoid an accidental power-off during an update.
 
Is there a command line option for turning off the battery check?  I know /s is silient, but is there one for the battery check?
 

A:Battery isnt detected on T520 after upgrading to Windows 10

[Message moved to ThinkPad: T400 / T500 and newer T series Laptops section for visibility.  AG]

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RELEVANCY SCORE 56

Where did the Battery Status Message go in Lenovo Settings? - the box is empty? It used to display/post status messages on the battery....

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RELEVANCY SCORE 52.8

I have had this laptop for a few months now. I am planning to upgrade the processor. I'm really just looking for a fan/heatsink to combat it's insane heat. Is there even a powerful enough fan, if so will it withstand OC for longer amounts of time. Even 24 hours. Help.

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RELEVANCY SCORE 52.8

I have had this laptop for a few months now. I am planning to upgrade the processor. I'm really just looking for a fan/heatsink to combat it's insane heat. Is there even a powerful enough fan, if so will it withstand OC for longer amounts of time. Even 24 hours. Help.

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RELEVANCY SCORE 52.8

I have had this laptop for a few months now. I am planning to upgrade the processor. I'm really just looking for a fan/heatsink to combat it's insane heat. Is there even a powerful enough fan, if so will it withstand OC for longer amounts of time. Even 24 hours. Help. To all who have read my request and those who will read this will this be sufficient http://m.ebay.com/itm/262933210164?_mwBanner=1

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RELEVANCY SCORE 52

Hi,

Ive been working on this old computer and it had a bad CMOS battery. It was the kind where you put AA's into it and then it plugged into the motherboard. I replaced it, but now the hard drive settings are all screwed up. I went into the Bios Program to set everything. But none of the options matches the hard drive. I know for a fact that this computer worked before the cmos battery went dead. The options in BIOS you can only set to
Type 1, Type2, etc. There is no "USER" setting where you can just put in the numbers of heads/cylinders/sectors. What should i do?
 

A:CMOS battery

If you have no user or auto settings try setting the bios to type one. Hopefully the drive was originally using a drive overlay and will boot ok with this setting.
 

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RELEVANCY SCORE 52

Do I have to do anything after changing cmos battery? 

A:Cmos battery

Assuming that the CMOS battery was already changed, it would be wise to enter the BIOS, check the time & date and then set the BIOS to defaults, save and exit.

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RELEVANCY SCORE 52

It's time to change the battery (first time for a machine I bought in 2004 - not a bad run). I can't get the old one out....any suggestions?
 

A:CMOS Battery

On side should have a metal contact.
You need to carefully pry it toward that contact as it is spring loaded,
then lift from the other side.
Should pop right out.
Be careful you don't want to break the socket.
Some older cmos batteries were soldered on,but I haven't
seen that since around 2000.
 

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RELEVANCY SCORE 52

i have an acer extensa 5620z which could only power on in few seconds then goes back off ,i did some research and i discovered that it was the cmos battery that was dead so i change hopping that every was going to be fine . when i plug the adaptor in to a power extension, first the pc came on automatically and when i shut it down to and couple it ,it could not come on again.so i discovered that each time i remove the cmos battery and put it back the machine will power on but once i shut it down and couple it will not come on even to show a light .so i dont know if there is a configuration that i need to do please help me

A:cmos battery

Hi and Welcome to TSF!

A dying CMOS battery shouldn't prevent booting. A dying power supply or battery on the other hand might.

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RELEVANCY SCORE 52

What kind of battery do I need for B690, generic button or something special?

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RELEVANCY SCORE 52
RELEVANCY SCORE 52

would it be a bad idea to replace the cmos battery in a desktop computer while it is powered on? i want to do this because it would prevent the loss of any information such as system time and some bios settings (boot sequence).
 

A:CMOS Battery

Yes.....a Bad Idea.......
 

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RELEVANCY SCORE 52

I just tried to install a new battery and broke the spring clip part of the socket. Is there a remedy? TIA, Brian
 

A:Cmos Battery

Unfortunately there really is no easy repair for this. It would require desoldering the old battery socket and soldering a new one in. While this is not rocket science, it does take great care and some skill to do. A minor slip or laving the soldering iron in place too long can do some real damage to a motherboard. It is best left to a technicial with the proper equipment and skill to do. I would consult your local computer shop about this repair. And it may take a referal to someone else.
 

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RELEVANCY SCORE 52

Is there a default in set up after replacing the cmos battery or should you take a picture with the flash off just in case?
I cannot think of any other way to know the information as print screen etc cannot be used.
TY
Peter

A:cmos battery

Replacing the CMOS battery will probably reset the BIOS settings to their defaults. Unless you or someone else has changed the settings, that will be the same as what you have now.

You could use a camera (or smartphone) with the flash turned off to record the settings. Or, you could just use pencil and paper. (Dell typically provides a fairly limited selection of settings. That's not intended as criticism.)

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RELEVANCY SCORE 52

Is it possible to leave a CMOS battery out of a computer for 24 hours without hurting anything?
 

A:CMOS battery

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RELEVANCY SCORE 52

I recently had a major computer crash following a lightning storm and a lengthy power failure. I feared the worst and called out a tech. It turned out that the CMOS battery was dead and when the power had failed, the CMOS settings were lost.

The tech said that under normal circumstances, as long as the computer was connect to the power supply, the settings were retained but when the power failed, the settings went.

So if I just use system shut down on the computer at night, there is obviously power still getting to the computer. However I assume if if I actually turn off the computer on/off switch then there will be no power getting through and the CMOS battery takes over.

If I do that every time I turn off the compueter I assume that the CMOS battery will not last as long.

Am I correct?
 

A:CMOS Battery

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RELEVANCY SCORE 52

Hi,
I have a ASUS motherboard.When my Pc star to bootup,I have a line in the end that tall me that the Cmos Batt is lower and the date and time is not accurate or something like that.What kind the battery is this one and what do I have to do to change?

Thanks

Joaquin.
 

A:Cmos Battery

The most commonly used battery is CR2032. If you still have the P4S800-MX motherboard (from a May post), turn off your PC and remove the left side cover. The battery is a 5 cent coin size disk near your IDE drive connectors.

You can get the battery about anywhere (I saw them at the grocery store last week).
 

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RELEVANCY SCORE 52

Wife has a compaq S4100NX that on more than one occasion has lost the tiem by one hr.(went backwards). So I started looking for a cmos battery and MUCH to my surprise, there isn't one on the MB. I thought all MB's has a cmos battery ????

Any different idea(s) on why it looses time ?
 

A:No CMOS battery ?

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RELEVANCY SCORE 52

I HAVE A ACER ASPIRE LAPTOP 7551-3068,  FIRST IT WOULDNT POWER UP SO i CHANGED THE EXTERNAL BATTERY AND THE POWER SUPPLY CORD. NOW IT POWERS UP BUT IT BLINKS AT THE BEGINNING OF THE WINDOWS STATUP AND IT TAKES A LONG TIME TO BOOT UP. ON SEVERAL SITES IT SAYS TO CHANGE THE CMOS BATTERY, WHERE IS THIS LOCATED?

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RELEVANCY SCORE 52

Hi guys and gals, quick question. I have a HP Pavilion G7 laptop that was giving me some cmos error messages so after some ridiculously rigorous searching, I found the battery. My question is, does the numbers on the battery mean anything? Meaning, ive found HP pavilion Gy batteries on line for sale but the numbers on the sticker on the rubber housing dont seem to match. Im wondering if that is just the warehouses part ID. This one says, "1126. 12." If anyone is familiar with these please let me know. Thanks

Bob
 

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RELEVANCY SCORE 52

I Have an old 166 Pentiun computer with a i430vx mainboard. My problem is that the CMOS battery is dying and from what I could find on the net, it is enclosed in a discontinued Houston Tech HT12888A RTC chip. Some of the info on the internet says that you can open the chip and change the battery though it may be soldered in place and other sources say to replace the motherboard. Also will an add in card containing a clock also power the CMOS. I leave the computer on all the time and it runs fine but when I shut it down and reboot I lose time and have started getting a checksum error/CMOS battery failed message. I have another computer and would like to give this to my son and would hate to scrap a good machine for a $3.00 battery. Any info on this problem would be greatly appriciated.
 

A:CMOS Battery

Well I could understand not wanting to scrap the system due to a battery. There are several options you could look in to. 1. you could purchase a new mother board( for under $100) install it and actually have expansion room for later, or 2. You could scrap the system and keep it to use its parts as test parts or replacement parts for another computer. If it was me that faced this problem I'd look at a new motherboard first maybe you could even find a good used one.
 

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RELEVANCY SCORE 52

I have a Compaq Presario 7360 Desktop PC and I am not sure what kind of cmos battery it needs to be replaced with. Can someone please help me out with this. Also, how much do they cost. Thanks in advance.
 

A:CMOS battery

unplug the PC, even the power cord at the back
ground yourself (ie touch metal, discharge static)
open the case and point a flashlight at it
carefully pry it out, usually a clip you GENTLY pull back to allow the battery to pop out
(you do NOT want to break the clip off)

any radio shack or pc store will have them

about $5
 

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RELEVANCY SCORE 52

Hi everyone,
I have an NEC Versa 4230, with win95,133mhz notebook. When I turn it on it tells me the system battery is dead, and to replace it. Thing is I don't know where it is at or where to get one. Do places like circuit city sell them. Any help would be greatly appreciated. Thanks , JOE
 

A:cmos battery

Well I looked it up a NEC and the bad news is they say must be replaced by certified NEC site.

Either they just want to charge the money or it's not easy to do.

Could be soldered to motherboard instead of clip type which is a major pain.

Sorry, don't have any better info for you
 

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RELEVANCY SCORE 52

I have a 486 mother board. When I boot up into DOS I get a message saying, CMOS BATTERY LOW. How do I replace it.
 

A:CMOS Battery

Crack the case open and look for it. THe older ones on 386 and 486 motherboards were some times integrated into the BIOS so you might be out of luck. Others had a small black pack that looked like 4 AAA batteries connected together and a red/black set of wires running to the motherboard....you can still get those.
 

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RELEVANCY SCORE 52

Want to change my CMOS battery....what will I lose while it's out ? What will I have to reset other than the time and date ?KENNY
 

A:CMOS battery

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RELEVANCY SCORE 52

I need to know which way the wires (2 of them total) go on my compaq armada 7770dmt. While replacing the cmos battery I got the wires mixed up when I put the plastic end on. Since the plastic piece only fits one way I know that it must matter which way the wires are attaached. The colors of the wires are red and white. I cannot find a schematic for the motherboard.
 

A:cmos battery

i cant find anything on the HP website
you may want to post the question in the support forum
http://forums1.itrc.hp.com/service/...Id=274&admit=716493758+1100435867876+28353475
 

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RELEVANCY SCORE 52

Question. In the motherboard manual it says to use a flat screwdriver to pry the cmos battery to change it. Well, I was doing that and the cmos battery sparked. First question is, what tool do you guys recemend. So, the motherboard cmos holder doesn't break, and so it doesn't spark again?
Second, is a spark from a 3v cmos battery harmfull to me, if it came up the screwdriver? I don't even know if it did, but I was a little freaked out by the spark, because it didn't say anything about it possibly happening. Of course, the pc was not plugged into a wall or anything. It, was just the battery itself.

Thanks everyone
 

A:Cmos 3v battery

Probably ran into a residual charge on the power supply.
Want to make sure not to short the 2 battery contacts or
short it to any metal on the case.
You can usually discharge a lot of that by pressing the power
button with the power supply turned off or unplugged.
The battery holder should have metal clips on one side.
Press on the opposite side of the battery to push it against the clips
then lift it out.
The clips are spring loaded to hold it in.
 

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RELEVANCY SCORE 52

Not sure I am in the right section of forums but hope I can get a response. My computer is an Acer AX 3300. My problem is the CMOS battery is failing. I have a new battery CR 2032, which is, I understand the most likely type of battery to be in this computer. I have removed the side panel in the hope of seeing the CMOS but cannot locate it.
Before I start to dissemble the computer any more, can anyone tell me exactly where the CMOS is located in this machine.
Will appreciate any help as I have never taken any computer apart before.
 

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RELEVANCY SCORE 52

I was having a problem with the computer keeping time while it was shutoff. I installed a new cmos battery and the time is still not keeping when powered off. Any suggestions.
 

A:CMOS Battery

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RELEVANCY SCORE 52

Hi can someone help please I need to replace the CMOS battery in my laptop but have not had any look purchasing one all local retailers say they dont stock them even the one where I purcased the laptop from, I did get one from Amazon which said it was the correct one but when I recieved it it was a slightly different end to the cable so can someone advise please. The model is HP G62 Notebook & the battery is a CR2032HF-243V. Thanks Normski.

A:CMOS Battery

Norm. To better help you we would need the exact model number or product number of your laptop/desktop??? http://support.hp.com/us-en/document/c00033108 REO

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RELEVANCY SCORE 52

Hi guys,

My computer just started having this problem since Christmas. I've had this mobo since 2007, and this is the first time when I switch on the comp it gives me thsese messages randomly:

"CMOS battery low"
"Error loading drive A"
"Error boot sequence"
"Press F2 to continue or F1 to enter setup"

I went into the BIOS and it is always set at factory default settings, even when I attempt to change them to the previous settings I had. It gives me a message that says that because the CMOS battery is low, my date and time and other BIOS settings will be reset to default, then gives me the error boot sequence msg, and still continues to load windows, and desktop is messed up a bit, but otherwise "normal" except for the sys tray that's missing icons...

I have never really encountered this situation before, but the solution seems straightforward: replace the CMOS battery, only that I don't know where to find it! I've tried tigerdirect.ca, newegg.ca and even a local computer store, but they don't have it on their website.

My mobo is an OEM (Lenovo 3000 J205-9686) ASUS M2A-VM with a 690G chipset & AM2 socket. What additional details do you need to know what CMOS battery I need to buy, and if possible, any websites I can go to in order to find it (preferrably Canadian due to shipping costs, but I don't mind US).

Also, my OS is win 7 RC (although that might not be relevant)... Read more

A:CMOS battery low, help?

CMOS batteries are almost always CR 2032 basically a button battery taht is a available in most big box stores or electronic store. Take the side of the case off and see if you can locate
 

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RELEVANCY SCORE 52

My CPU clock was messing up constintly on my so I wanted to change out the battery. I did that with no difficulty. When I restarted my computer all that happined was that it beeped at me the code was.. 2 quick then 9. My computer is know a fancy paper weight I can't even boot from a disk, cd or floppy)There is no signal going to the monitor I have a Matsonic Ms6260s motherboard.
Help!!
 

A:CMOS battery

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RELEVANCY SCORE 52

CMOS battery

What happens and what is the danger to your computer if the CMOS battery dies?
 

A:CMOS battery

The CMOS battery is a very low powered device, just like a little watch battery.

So don't stress, it ain't gonna kill you.

However, its needed to keep data in the CMOS. The CMOS tells the computer what processor is installed (although many computers have jumpers set to tell it this), what drives you have (diskette, hard disk, CD-ROM, and others, and importantly your hard drive's geometry), how much memory is installed, and other important data that your computer needs to know in order to run correctly....

I imagine what would happen if it completely ran out would be that the CMOS would have to be re-written to manually in your BIOS program every time the machine was powered on for anything like normal operating to occur. Certainly you would loose the time settings and would have to redirect the BIOS to redetect the hard drives everytime you powered on.

You can replace a CMOS battery quickly and easily. They are very cheap and just clip out and in to the motherboard. It resembles a small silver disc about the size of a coin.

This is assuming that your computer is not totally ancient (like a 8088, 8086, maybe 286 or something) where the CMOS battery was sometimes not removable. If this is the case then get a new computer you sad man..... Otherwise, it will cost you nothing to replace and if you are not sure of yourself a computer store will do it in about 1 minute.
 

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RELEVANCY SCORE 52

what is this error when i boot my cusin portable it doest boot immediately error appears as" bad cmos battery -error date & time. it says there that i need to choose either f2 (utilities bios or press f1 .when press f2 it goes straight to bios of course! but the best option is to press f1 so it will bot normaly to the xp windows OS specs is WIN XP SP1. Do we need to replace the cmos battery now.
 

A:Bad CMOS battery

Does it do this on every boot up? Have you tried going F2, after your in the bios hit F10 (should prompt you to SAVE, if not, then exit and save) If it continues to do this then yes, you will need to replace the CMOS battery and hope that it is just the battery and not where it sits.
 

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RELEVANCY SCORE 52

Well im about to take out my CMOS battery and need to know if it will reset everything that ive downloaded or just my bioes settings will it reset my password for the admin?

If i remove the CMOS battery will it clear everything like a reformat?

A:CMOS battery

Clearing the CMOS will only clear your BIOS settings like Boot order, CPU settings, stuff like that. It will not format anything, nor will it reset any passwords. Even if it is a bios password, most manufacturers make sure that it is a little harder then that to clear the password. If you have forgotten your password for windows it will not effect that but there are ways to do that.

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