Acer C720 battery hassles

Hello,
I own since 2015 an Acer C720 which works like a dream and fulfills all my needs. After some years the battery seemed to go to EOL. It went down from 100% to 50% in 2 hours relatively linear, and then from 50% to zero within a few minutes. So, what? I just bought a new battery (the dealer claimed "Acer original"). This showed on first boot 100% and lasts for around 4,5 hours, After this, it charged only to 78% and the amber light turns blue, but the battery level shows 78% only. During the next few days this maximum went up day by day by 1%. And while working it lasted yesterday from 88% to 12% four hours and the rest was consumed within 2 minutes. What does this mean, that the maximum does not reach 100% ?
Thanks, Matthias

Accepted answers

Commodore_1995#

A slight variation in voltage is acceptable. Even the battery you have installed is compatible with your notebook, see:

All comments

gurucubano

No. The dealer does not respond and has an invalid postal addr in Germany
I claimed and got back the 50 euro from Visa. I will buy another one.

gurucubano

I bought another one and installed it on the weekend. Remarks:

When I installed the new battery, it was empty, no LED turned on. The Acer C720 did not start without attaching power supply.
The battery charged to 100% in around three hours while using the laptop
After this I removed the power and let it drain under usage. It went off after 6 hours.
The original (three years old) battery was of type AP13J3K, the now removed is also AP13J3K, the now installed is AP13J4K, all claim being compatible with C720, C720P, ... I don't know what the difference is between AP13J4K and AP13J3K.

Commodore_1995#

The battery partbumber may vary, as long as it is compatible with your notebook. However, the battery voltage should be identical to the original battery!

gurucubano

The original old one has 11.25V output, all others have 11.41V. Any concern or is in the limits of tolerance?

Commodore_1995#

A slight variation in voltage is acceptable. Even the battery you have installed is compatible with your notebook, see:

gurucubano

¡Obrigado!

Commodore_1995#

De nada my friend

gurucubano

I have here a chart picture of the battery discharging (the gap near second 18000 is due to not have written down data):

Image: https://us.v-cdn.net/6029997/uploads/editor/nh/1weq7nxgflsu.jpg

Commodore_1995#

Type this command in power sheel with administrator: powercfg /batteryreport /output "C:\battery_report.html"

gurucubano

My Acer C720 does not run Windows, lucky I am. Didn't I said this somewhere in this thread? I have no Windows in all in my house. Only Linux and FreeBSD, even on the four smartphones in my family Ubuntu is installed.

Commodore_1995#

type this command: alias bat="upower -i /org/freedesktop/UPower/devices/battery_BAT0"

gurucubano

FreeBSD:

$ while true; do batteryLive=`/sbin/sysctl -n hw.acpi.battery.life`

echo `date` ': ' ${batteryLive 'percent'

sleep 60

done
Wed May 22 15:19:18 CEST 2019 : 100 percent
Wed May 22 15:20:18 CEST 2019 : 100 percent
Wed May 22 15:21:18 CEST 2019 : 99 percent
Wed May 22 15:22:18 CEST 2019 : 99 percent
Wed May 22 15:23:18 CEST 2019 : 99 percent
Wed May 22 15:24:18 CEST 2019 : 98 percent
Wed May 22 15:25:18 CEST 2019 : 98 percent
...

Commodore_1995#

Some users report that the c720 battery on linux, lasts about six hours! Have you already disabled bluetooth and other devices to check if the battery lasts longer?

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