Hardware What I’m Up To

The dirty little secret about the ThinkPad T430’s CMOS battery

I’ve hung onto an old Lenovo ThinkPad T430 that’s been performing yeoman’s service over the past few years as a trusty Linux development machine and server. Its CMOS battery finally ran out, which meant that it no longer kept proper time when removed from power, which meant that I always got this message on startup:

I’m going to be teaching a Python course in the evenings in a matter of days, and wanted to be have the ThinkPad loaded up with Linux Mint 19.3 and Anaconda Individual Edition for that purpose. Without much thought and some very quick Googling, I found that Amazon could get a replacement battery to me the next day for less than ten bucks. Sold!

As promised, it arrived the next day. Here’s the box it came in:

I’m not complaining. There are all sorts of economics-based reasons for shipping something so tiny in that size box, and I’m grateful for the huge “crumple zone” provided by that box.

I knew where the battery went, thanks to an earlier adventure in which I upgraded the T430’s RAM (which requires you to do so in two separate locations on the machine). It’s under the central panel on the underside of the machine:

Replacing the battery was a snap: Disconnect the old battery’s connector, and then attach the the new battery in the same way.

I got curious. What was under the yellow protective plastic cover?

I peeled it off the old battery and found this:

The yellow protector concealed a run-of-the-mill CR2032 3-volt “coin”-type battery, and nothing more. The remote for my BOSE speakers uses one, as does my hand-held luggage scale. They also power the light on proctoscopes, in case you were wondering what kind of batteries yours took:

You can buy them in 5-packs at your local drug store, and their unit price comes to about 50 cents each.

I have a bunch of them in my drawer, and could’ve simply taken the connector from my dead battery and taped it to a fresh one. The red lead goes to the battery’s + side, while the black lead goes to its – side:

The money doesn’t bug me as much as the missed DIY opportunity, even if it was an incredibly minor one. I’m posting this for the benefit of anyone who has to replace a CMOS battery soon: You can do it without shelling out for an “official” battery!


11 replies on “The dirty little secret about the ThinkPad T430’s CMOS battery”

Useful…if you have the tools to spot weld terminal strips onto the battery. Lithium batteries are not a normal soldering situation. I have been looking for a simple battery holder that would fit beneath the bottom panel of my various T4xx laptops (and everything else).

When I first started getting this error, I did exactly same thing, I peeled of the yellow cover and replaced the battery but I did not have soldering tool so it was inappropriately fixed so no wonder ,I continuously got this error, then I decided to order one from Amazon and replaced it however to till date I still get this error not sure why. Any idea?

You do not use a soldering iron with these batteries they will explode. You use electrical tape or aluminium tape, then you wrap both sides well in run of the mill electrical tape you can purchase the shrinking plastic if you wish to make it look professionally done.

Cor blimey! If only I’d seen this before buying my replacement. Same as you, I’m sad I missed the chance to MacGyver something,

I was thinking you meant the T430s, not the plural of T430, the computers are a bit different, the T430s seems to need alot more disassembly, so it may be a good idea to remove the apostrophe s (‘s) from the post as it’s a bit confusing.

The CMOS battery is unerneath the keyboard on my T430S – easy job – just two more screws compared to the regular T430

Comments are closed.