The battery level % reported in Zentra is based upon voltage measurement of the installed batteries proportionate to a 6.0VDC Typical Operating Voltage and not percentage of "battery life" remaining.
Please see the following page of the Zentra manual for Low and Critical Battery voltage measurement levels for each device type:
https://manual.living.zentra.co/zentra-product-manual/1/en/topic/low-and-critical-battery-voltages
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