Solved: Thinkpad T430 shuts downWhen power is unplugged even 99% charged

Oct. 13, 2021, 12:13 a.m.


Battery showing 99% charged

When power is unplugged, the laptop dies within around 10 seconds

Unable to carry out calibration using 'Lenovo Vantage' because it won't charge to 100% (it's stuck on 99%, been on charge for hours)

Battery is ready for the bin?

Oct. 13, 2021, 3:58 p.m.

Yes mate it’s toast probably a dropped cell, not worth the hassle

pain in the arse, that's my only remaining 6-cell. I don't like the 'sticky out' 9-cell batteries lol 😂

at least you have a spare!

just fully charged a spare 9-cell. Vantage says it holds 25% of its original capacity. 45mins estimated life 🙈😂 won't be long before this gets thrown too lol 😂🤣

Oct. 12, 2021, 1:23 a.m.

Likely yes

Oct. 12, 2021, 1:23 a.m.


Oct. 13, 2021, 2:25 p.m.

If this is the original battery supplied with the machine then yes, it is most likely dead. Even if it wasn't used much since 2013, cells will degrade from age as well.

yes, it's an original genuine one, manufactured 2013, with 340 charge cycles. Time for a new one I think.

I do have another, a 9 cell, original from 2013, with only 39 charge cycles. But Vantage shows that it only holds around 25% of its original capacity. So that looks like it's dying too.

Oct. 13, 2021, 8:59 p.m.

Sounds like one (or more) of the cells are dead. Depending on wish to experience you can take it apart and meassure the individul cells to see which one (or more) are dead and then replace that one.
Likely not worthwhile from an $ point of view sp shoul only be done for the fun of it.

Oct. 13, 2021, 2:43 a.m.

If you want to be certain, use HWInfo64, list all sensors supported by your machine, then scroll down on battery.
You are interested in 2 things-charge rate(negative value means discharge) and battery voltage.
Notable cases:
1) dead battery-batt level not even near 90%, charge rate in peaks, followed by voltage peak. This had happened to me and it means battery in which one or more cells died. Normally, this is where i would have dismantled whole pack and test each cell.separately to figure out which one died, then use them for another purpose.
2) healthy battery-charge rate constant, voltage and batt level steadily increasing/decreasing over time.
You can export data to excel and create graphs. I was lazy so i wrote python script which does that for me.
3) almost dead battery. Note that you can figure this one out only through graph and you will require stress test software. Furmark does the job. Batt level steadily decreasing while discharging, voltage drop SEEMS ok. The moment you increase power consumption(start cpu stress test) voltage drops rapidly and might even cause power loss. This means that while battery.may have some remaing capacity, its internal resistance increased. Might be causwd by one of cells being dead-usually 2 cells are connected in parallel so for light load one might be enough but for heavy load, it won't keep up with demand.
Treat this as a pre-fail sign.

that's very helpful, thank you!
Will download HWInfo64 and see what's going on 😊

Just a (future) engineer and tinkerer sharing experience :)

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