One idea is to make this set similar to the battery set but with the outline being a simple, non battery-shaped, rectangle.
Another idea is for the outline to be a circle and the different percentages/levels to be indicated as in a pie chart.
Finally, it could be an hexagonal outline with six states represented by a progression of triangles.
Something like this?


@SarinManS Did you create those? If so, please upload the SVGs in a ZIP file and attach them so we can consider them to be added.
They're beautiful! I didn't expect that much! I like the first set the
most, specially because of the separation between the circle and its
contents.
On Mon, Aug 6, 2018 at 1:48 PM, Michael Irigoyen notifications@github.com
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@SarinManS https://github.com/SarinManS Did you create those? If so,
please upload the SVGs in a ZIP file and attach them so we can consider
them to be added.—
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I like the hexagon, but agree, it might look nicer with a similar separation.
Sorry forgot to attach the ZIP earlier.
Modified the hexagon to have a similar gap from the stroke.
Here's a sample.

Here are both of them.
https://materialdesignicons.com/contributor/SarinManS You can see them on your contributor page, not going to individually link the previews. 😹
Looks like hex slice 5 is wrong.
Fixed, accidentally exported over it apparently. Was in a rush earlier to leave the cafe.
Thanks guys
hexagon-slice-5 is still wrong! 😜
How can I get these icons? I use the Nerd Font pack but I'm unable to find them in their cheat sheet (looking for circle or slice). Neither am I able to find them in Material Design Icons list. The only place where they seem to be available is https://materialdesignicons.com/contributor/SarinManS.
If any icons (bar those waiting official release) are missing from something being provided by a third party then that's something that needs to be brought up with that third party, which I see you've already done.
Looking at their repo, they seem to be using MDI v2.1.19 while the latest release is v3.4.93 so there are nearly 1400(!) icons missing from their collection. I'd suggest using one of our official releases instead to ensure you always have access to the latest icons or, at least, a third party that stays up-to-date with new releases.
Most helpful comment
Something like this?