Bug 444847

Summary:	Battery health jumps all over the place.
Product:	[Plasma] plasmashell	Reporter:	yizel7
Component:	Power and Battery widget	Assignee:	Kai Uwe Broulik <kde>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	plasma-bugs
Priority:	NOR
Version:	5.23.2
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description yizel7 2021-11-02 17:41:37 UTC

In the one month I have been using KDE Plasma 5 and occasionally I hover over my battery system tray icon. The battery health % keeps jumping all over the place. I have seen the following in roughly this order:
100%
98%
99%
96%
100%
98%
100%
97%
99%
100%

Can the algorithm for this be looked at and improved if possible?

STEPS TO REPRODUCE
1. Buy a new laptop and install KDE Plasma minimal
2. Hover over the battery system tray icon and note the battery health %
3. Use your computer as you would for a couple days
4. Hover over the battery system tray icon and note the battery health %

OBSERVED RESULT
Not guaranteed but the health will probably say a number between 95% and 100%.

EXPECTED RESULT
Battery health should be accurate. It should not be possible for the battery to lose up to 5% of battery health in the matter of a few days when it is only used a couple hours a day. At which point the laptop battery would be dead within the span of a month or two. Let alone for the battery health to improve itself.

SOFTWARE/OS VERSIONS
OS: Arch Linux x86_64
Kernel: 5.14.15-arch1-1
(available in About System)
KDE Plasma Version: 5.23.2
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.2
Graphics Platform: X11

Comment 1 Kai Uwe Broulik 2021-11-02 18:24:42 UTC

All it does is look at the last full charge and compare that to the design capacity of the battery. This can vary from time to time.

In any case, this data comes straight from UPower, so you might want to report an issue there.