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Jon Vexler 81ae9dd779 feat: smooth battery percentage for x4 (#1635)
## Summary

Battery percentage is calculated from the voltage, which is not totally
stable. We smooth the battery percentage using a moving average.

## Additional Context
issue discussion:
https://github.com/crosspoint-reader/crosspoint-reader/issues/1444

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### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? 
PARTIALLY
2026-04-16 00:28:43 -05:00
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