T60 - occasional battery glitch after standby

[dr_st]

My corporate T60 (1952-F76) recently developed a peculiar issue.

At work and at home I often find myself changing the power states a few times a day:
* Docked
* Undocked and on AC
* Undocked and on battery

Often when I walk between conference rooms and disconnect from AC for a while, I put the laptop on standby (Fn+F4).

Every once in a while, bringing it back from standby results in some sort of disconnection between the battery and the laptop.

One of two things may happen:

* If the laptop is unplugged, the instant it exits from standby, it powers off completely, as if the battery was yanked out of it. At this point it can be powered on and continues working just fine on battery.

* If the laptop is connected to AC, it will resume from standby, and continue working fine, but the battery won't charge. This has nothing to do with charging thresholds, since it happens even when the battery level is below the thresholds.

So basically it is like the laptop enters a weird state where it does not "feel" the battery, even though it is detected in the power manager. The only way to bring it out of it is to cycle power, which is obviously and inconvenience, and if I happened to be unplugged when this glitch occurred, I also lose all the open applications and unsaved data, which kind of sucks.

It looks like a hardware issue - the question is whether it's the board or the battery? Currently I find it difficult to debug, because it happens fairly infrequently (maybe once every week or two).

Anyone ever experienced something similar?

[netzspannung]

I had a battery crap out on another T60. They have electronic controllers inside which are not very reliable. There was an IBM recall a couple of years ago, a series of batteries was defective.
In short, I think it's the battery itself.
What BIOS version do you have? My battery failed after a bios update and "locked" itself, no more charging allowed. You may try updating the bios and see if it dies completely