fix: improve calc for usable (now) in battery health dashboard

[swiffer]

fixes #4642

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[swiffer]

@JakobLichterfeld - lgtm, should improve in situations reported in #4642

[JakobLichterfeld]

lgtm. Ty!
As our test images are currently only generated for branches in TeslaMate repo, it would be awesome if you can open new PR with branches in our repo.

[swiffer]

My permissions seem to not allow that. I can neither comment on locked issues nor push to this repo as far as i know. Or do i need to change something locally?

[JakobLichterfeld]

My permissions seem to not allow that. I can neither comment on locked issues nor push to this repo as far as i know. Or do i need to change something locally?

Oh indeed, I added you with write role in TeslaMate repo just now (you have “only” been in the org)

[JakobLichterfeld]

I will fix the CI hopefully in the next weeks