0

The old battery of my X1 Carbon 4th Gen. was dying, and the battery readings became unreliable. So I had it replaced (with an official battery replacement).

Now the problem with the old battery and new battery (thus it's some calibration problem, and not one inherent with the battery) is the following:

When I discharge the battery, the battery reading becomes stuck at x% (currently at 7%) and does not drop further. I can still use the laptop for hours; until it suddenly drops to 0% and my laptop shuts down. sudo tlp-stat -b shows me without changing

/sys/class/power_supply/BAT0/energy_now = 3030 [mWh]

Charge = 7.2 [%]

When I plug in the charger after a while, while the battery shows 7%, the charging LED is off and the system, as well as tlp-stat tell me it's not charging (even though it is charging).

Furthermore, tlp does sometimes not respect my charging threshold at 80%. It charges until it displays 79% and when I pull out the charger, it displays 99%.

I tried resetting the power management (holding down the power button for 1 min when off). On the next boot it discharged to 0%, but got stuck at 10 mWh. I tried sudo tlp recalibrate but it couldn't finish due to being stuck again. The following boot, the charge again got stuck at 7%.

Are there any other ways to reset/recalibrate the battery?

3
  • I have that very machine siting beside me. I replaced the battery halfway through useful life with no issues. Try installing Lenovo Vantage, update it, and run the Battery calibration cycle - takes some hours. When done restart and test. If still issues see if you can have the battery replaced.
    – John
    Jan 19, 2023 at 16:26
  • Resetting power management often requires 1. Removing the battery. 2. Unplugging the charger. 3. Holding the power button for a minute. 4. Plug in power but not battery. 5. Boot, then power down. See techwalla.com/articles/how-to-hard-reset-a-laptop BTW, discharging a lithium battery, or even automotive lead-acid battery, completely greatly shortens it's service life, and might even destroy it in one go. (Ni-Cd, Ni-Fe and NiMH cells are less likely to be damaged by total discharge.) Jan 19, 2023 at 17:16
  • @DrMoishePippik yes, I am very aware that completely discharging lithium batteries can destroy them. In fact, the one time the charge dropped from 7% to 0% and shut down, it couldn't run without the power cord for about an hour... I will check out the guide for nonremovable batteries, thanks! @ John I'll try that first! Jan 19, 2023 at 17:33

0

You must log in to answer this question.

Browse other questions tagged .