What does capacity means?

does it mean 88% of battery life is damaged?

Yes, exactly.

I am really sad to hear that but thanks @Photon

Wait until it is fully charged, reboot, and test it again.

Thanks @c00ter

In case if I Change battery do I have to reinstall the entire OS?

Also here:

That is a fair question. On older laptops, battery packs snapped in/out, but nowadays it appears they are more integrated like my mid-2014 Dell, so my answer is, "I don't know."

But somebody here will. :smiley:


I believe the answer would still be no, the OS is stored on an HDD or SSD. changing the battery even if you had to tear down and do it internally may however reset the BIOS or UEFI firmware settings so before starting, enter that interface and make a note of all options which can be toggled.

make sure the time and date are correct afterwards as well


I don't use my laptop for gaming purpose so if I remove the graphic driver would that increase in some battery life ? I am using free driversScreenshot%20from%202018-02-03%2012-17-29Screenshot%20from%202018-02-03%2012-17-44.

Your battery most certainly is close to its death.

You compare energy_full_design with energy_full.

Those figures will not change after a full charge cycle and a reboot.

So true. I tried that with my laptop but the capacity remains the same, no matter what I try. For me, after 7 years, it is still at 77.3%

It's decreasing day by day

+++ Battery Status
/sys/class/power_supply/BAT1/manufacturer = LENOVO
/sys/class/power_supply/BAT1/model_name = PABAS0241231
/sys/class/power_supply/BAT1/cycle_count = (not supported)
/sys/class/power_supply/BAT1/energy_full_design = 38880 [mWh]
/sys/class/power_supply/BAT1/energy_full = 4640 [mWh]
/sys/class/power_supply/BAT1/energy_now = 2230 [mWh]
/sys/class/power_supply/BAT1/power_now = 653160 [mW]
/sys/class/power_supply/BAT1/status = Charging

Charge = 48.1 [%]
Capacity = 11.9 [%]

day before yesterday it was 12.1%
yesterday it was 12%
and Today it is 11.9%

how do I check how many cells my battery contains?

Anything under 60% or so will start to decrease rather rapidly... especially after you start leaving it plugged in all the time. Just gotta get a new one my friend.

Also, doing a power cycle (full charge (+few hours hold), full drain, full charge) will give a better reading, as in accuracy, which usually results in showing an even lower capacity.

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Google the mfg/mod. name you posted.

Yes to add to this if I were looking for a replacement I would look up the lappy model, not the battery. Then get the best price/capacity/cells I can find. Maybe yours was 4 cell to begin with, but theres 6 cells that fit for cheap enough. No reason to have to stick with a lower grade just because its what you had. Just make sure it fits your machine.

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One Google query is enough.

Usually not, but if you get problems you can select the "Fallback" boot entry in Grub and then run
sudo mkinitcpio -P
and reboot.

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I have changed my battery without reinstalling the entire OS and it's working fine.

+++ Battery Status
/sys/class/power_supply/BAT1/manufacturer = LENOVO
/sys/class/power_supply/BAT1/model_name = PABAS0241231
/sys/class/power_supply/BAT1/cycle_count = (not supported)
/sys/class/power_supply/BAT1/energy_full_design = 47520 [mWh]
/sys/class/power_supply/BAT1/energy_full = 47470 [mWh]
/sys/class/power_supply/BAT1/energy_now = 18070 [mWh]
/sys/class/power_supply/BAT1/power_now = 628430 [mW]
/sys/class/power_supply/BAT1/status = Charging

Charge = 38.1 [%]
Capacity = 99.9 [%]

but please explain me why power_now is so high and what's energy_now means.

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This means how much energy the battery holds now.

628W is indeed a bit high, though. :smiley: Something between 10 and 20W would be more realistic...

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