Forum Thread

CMOS battery won't stay in - any ideas on what to do?

RaccoonTail 24 10 October 15, 2015 at 02:09 PM
I've been changing the screen on a Dell laptop for someone I know, and the first screen I purchased wasn't compatible so I played around with some suggestions of removing the CMOS battery resetting the BIOS may detect it. When I removed it, apparently I broke off a small 'clip' sort of piece of plastic at the top.

The metal leads are still intact, and it still works, as long as you hold down on it to keep it in because there nothing to hold the battery in place to contact the 'spring' negative lead. The battery just stays risen on that side with nothing to hold it down.

I've Googled different things, and the best suggestion is a hot glue gun, which I hope works. I tried Krazy Glue because the bottom actually is just black plastic. I tested it and thought it worked, restarted a couple times, but a couple hours later it didn't hold and came loose again. Then again, I used only a tiny dot of it, and the Krazy Glue is probably a year old now and may not be viable. Electrical tape didn't seem to work on my attempt either.

Anyone have any ideas on what to do on this or come across this situation? Any help is much appreciated!

11 Comments

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#2
High temp hot glue is a decent option. Sugru might work, some target stores sell it.

A small piece of plastic and some hobby glue could also work.
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#4
Had the same problem on a laptop. I used toothpicks to wedge it in by putting them on both sides and then breaking off the extra. They also make CMOS battery adpaters if there is room for it. http://www.amazon.com/Pavilion-DV...os+battery

You may have to cut the leads and solder to the connectors
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Last edited by repitall October 15, 2015 at 04:05 PM
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#5
Thanks for the suggestions! I think I'll go with the hot glue and then maybe try the toothpick wedge idea, that's pretty novel. And the Sugru thing looks interesting in general, I've never heard of it, but it sounds pretty awesome according to their website.
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#6
Yeah I would try a combination of the toothpick as a wedge and hot glue. That way it is still removable by prying the battery up if needed. Obviously make sure you put in a new battery, so most likely it will not need to ever be changed again.

I was also thinking that for a more permanent fix, you can drill 2 tiny holes in the motherboard and zip tie it in. All depends if there is open motherboard space to do this.

Another idea would to use some kind of stick to wedge against the inside case cover and the battery to hold it in place.

Let us know how it turns out.
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#7
put anything between the battery and the cover(if has one)
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#8
If your good at soldering you should be able to replace the holder, they are a fairly generic part.That being said it's not leaded low temp solder, its probably a silver tin mix which makes it a bit more difficult.
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#9
Quote from RaccoonTail View Post :
I've been changing the screen on a Dell laptop for someone I know, and the first screen I purchased wasn't compatible so I played around with some suggestions of removing the CMOS battery resetting the BIOS may detect it. When I removed it, apparently I broke off a small 'clip' sort of piece of plastic at the top.

The metal leads are still intact, and it still works, as long as you hold down on it to keep it in because there nothing to hold the battery in place to contact the 'spring' negative lead. The battery just stays risen on that side with nothing to hold it down.

I've Googled different things, and the best suggestion is a hot glue gun, which I hope works. I tried Krazy Glue because the bottom actually is just black plastic. I tested it and thought it worked, restarted a couple times, but a couple hours later it didn't hold and came loose again. Then again, I used only a tiny dot of it, and the Krazy Glue is probably a year old now and may not be viable. Electrical tape didn't seem to work on my attempt either.

Anyone have any ideas on what to do on this or come across this situation? Any help is much appreciated!
Kapton tape is the industry's solution for what you need (but it's a little pricey)
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#10
Quote from Ero View Post :
Kapton tape is the industry's solution for what you need (but it's a little pricey)
Tape is cheap compared with the risk of doing just about everything else. A $10 roll of tape is fine if its stable enough.
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#11
Well I thought I would post the results. A little backstory on this: this has been the laptop from hell to replace just a screen. Initially when I ordered it from eBay, the seller sent me the wrong model he listed in his auction. It was the exact same model except with 0 at the end, and when I put it in, it wouldn't accept the model. I tried the CMOS removal just to see if the computer would accept it fresh, according to some support responses on the Dell forum. Of course it didn't work and thats when I unknowingly broke the almost unnoticeable plastic clip toppings on the plastic housing. I returned that screen, tried another auction from China and ordered it, but emailed the guy before it was sent and he also confirmed the listing number was incorrect. Finally I got the correct one that works.

Not only that, but following the disassemble instructions I saw on Youtube, they showed taking the entire laptop apart before you could remove the screen. That turned out to be completely unnecessary. All I had to do was remove the bezel and screws. I probably would have ended up doing that anyway with the CMOS suggestion, but thats even more frustrating.

Anyway, I got the hot glue gun and toothpicks earlier. It was clear there was no clearance at the top to even jam in toothpicks on the edges. So I tried the hot glue gun, and in my rush to get the battery in before the glue dried broke off the right side mini plastic that held THAT side in. Ugh. Maybe it was more beneficial though like that because it was causing the other side to flip upward. After putting the battery in and holding it there, it stayed, but definitely did not seem like a 'permanent' lock. Even pushing on it with the glue gun tip kinda moved it up some. Soo .. I sacrificed my fingers and pulled the dried glue off the top of the glue gun and took a nice burn to get the glue along the sides of the plastic housing where the leads weren't:



It seemed a little more secure, but I still wasn't convinced it would stay, so at this point I was like screw it, found some Scotch mounting putty and put it on the top so when I closed the top of the laptop casing and screw it in, it would put pressure on the battery holding it in.



Yeah I feel unprofessional as all hell, but outside of trying to solder it back on after ordering an adapter, there aren't many options. Which is pretty ridiculous for such a small, minor thing like this.

I feel like Loomis in Halloween saying "DIE DIE DIEE" to Michael Myers over and over with this thing. So far, no 5 beeps of BIOS doom when I started it up a few times, so hopefully this did the trick.
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#12
nice job w/ the putty, i had a similar issue where a clip for laptop memory broke.
I cut and folded a credit card to apply pressure
of course this was for the outer slot
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