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The template used | min(100) | max(0) which is invalid Jinja2 syntax. These filters expect iterables (lists), not scalar arguments. This caused TypeError warnings on every MQTT message and left battery sensors unavailable. Fixed by using proper list-based min/max: [[[value, 100] | min, 0] | max Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>