In Ubuntu 18.04, the default icons showing whether the laptop is on battery or plugged in, are quite similar:
Its really easy to miss when the laptop accidentally unplugs.
Is there a way to make the icons different, or to make it more prominent when the laptop is on battery?
02 Answers
From the attached pics in your Question gives clue that those icons are named as
battery-good-charging-symbolic.svg andbattery-good-symbolic.svg
There are similar Images with naming which can be understood easily.
First determine which icon theme is being used.
And then copying this Icon theme into ~/.icons directory and replacing the image with your preferred one but with same name of icon will change the symbol.
There is a good documentation here.
2I solved this by going to Tweaks → Top Bar → Turn on Battery Percentage.
Now the battery percentage is shown as a number, so if unplugged, the number shows as declining which is more attention grabbing than the icons.