Answer
The battery icon on the sensor card is an indicator of the charge available for the battery and its remaining lifespan, which is identified by the color -- fully charged (green), getting low (yellow), or needs replacing (red):
- If the battery icon is red, you need to immediately replace the it.
- If the battery icon is yellow, you should get a new battery and have it available -- though we recommend replacing batteries even when they are yellow.
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