I am using Xfce 4.16 on Manjaro 20.2.1 with the elementary Xfce dark theme. After a Manjaro update in January, I have now this icon (
) instead of the former icon (
). How can I get the former battery icon theme back?
The icon is depending on the overall icon theme.
So - dive into the Settings section - Appearance - and change the icon theme - I reckon it will solve your issue.
It will work only if this icon theme have icons for every 10% battery. @Thrash you can edit old theme – add links to prefered icons and give them names like in Papirus theme mentioned below 
How do I do that exactly? And is there a more elegant solution, for example by telling Xfce power manager to use the old icon (naming) system?