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CMOS Battery

By CLT-IT_Tech ·
I'm having a terrible time trying to locate a replacement CMOS battery for an old Gateway E-4200 tower PC. Any help???
-d

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by mjd420nova In reply to CMOS Battery

Is this the type that has a small connector on the MOBO?? Or the type that uses a small button battery?? The button batteries are available at radio shack. The other can be replaced with a 4 AA type pack, also available at radio shack or just about any electronics store. Be careful to be sure the right polarity on the system board.

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by TheChas In reply to CMOS Battery

As opposed to a coin cell, I assume that this PC has either a battery pack, or a battery that is soldered to the motherboard.

In either case, these are usually 3 cell Ni-Cad battery packs.

Have you tried special ordering a battery from Radio Shack?

If it is available, they should be able to get it for you.

Alternately, there are several options:

You can solder in a new battery pack.
CAUTION: You MUST have the right tools and skills to do this without damaging the motherboard.

Usually, for the soldered in battery there is a connector near the battery for an off board battery. You can CAREFULLY cut the battery terminals and connect a battery pack with 3 AA or AAA batteries in it.

You can use the same method to replace a remote battery pack.

There is one other battery system that was used for a while. The battery and Real-Time-Clock and CMOS were in a single package.

Dallas Semiconductor, (now part of Maxim) still made these modules the last time I checked.

http://para.maxim-ic.com/cache/en/results/4711.html

Chas

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by CLT-IT_Tech In reply to CMOS Battery

Was trying to avoid openning the box to see the battery but I guess from these answers I will have to do so. Will let you know!

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by TheChas In reply to CMOS Battery

A note for MDJ420Nova and a caution to others who might read this thread:

Using 4 batteries to replace a CMOS battery pack CAN damage your motherboard.

Most of the circuitry around the CMOS operates on 5 volt power. Using 4 AA batteries will result in 4.8 volts if you use Ni-Cad batteries which can be near the low limit of 5 volt power. If you instead used 4 regular or alkaline batteries, you would end up with 6 volts on the motherboard. This would cause damage.

EVERY CMOS back-up battery that I have seen that is NOT a coin cell is a stack of 3 rechargeable cells. This results in a safe 3.6 volt back-up power source.

Also, if you were to use rechargeable batteries, a 4 pack likely would not charge as the power on voltage differential would not be enough to have current flowing into the batteries.

Chas

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by HAL 9000 Moderator In reply to CMOS Battery

This is just a standard P11 System with a Intel BX 440 Chip Set and should take one of the coin like lithium batteries which are all covered by the 2032 Code.

These should be available all most anywhere depending on where you live but are a common battery type. As others have said Radio Shack or even one of the Big Retail outlets should have these available.

Col

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by saihib In reply to CMOS Battery

What you need is a standard 3 volt CR2032 battery. Lots of manufacturers make them. You can get them at most big name drug stores.

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