Nikon Z 6II Reference Manual page 790

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Do not use the battery at ambient temperatures below 0 °C (32 °F) or
above 40 °C (104 °F). Failure to observe this precaution could damage
the battery or impair its performance. Charge the battery indoors at
ambient temperatures of 5 °C–35 °C (41 °F–95 °F). The battery will not
charge if its temperature is below 0 °C (32 °F) or above 60 °C (140 °F).
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Capacity may be reduced and charging times increase at battery
temperatures from 0 °C (32 °F) to 15 °C (59 °F) and from 45 °C (113 °F) to
60 °C (140 °F).
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Batteries in general exhibit a drop in capacity at low ambient
temperatures. Even fresh batteries charged at temperatures under
about 5 °C (41 °F) may show a temporary increase from "0" to "1" in the
setup menu [Battery info] age display, but the display will return to
normal once the battery has been recharged at a temperature of about
20 °C (68 °F) or higher.
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Battery capacity drops at low temperatures. The change in capacity with
temperature is reflected in the camera battery-level display. As a result,
the battery display may show a drop in capacity as the temperature
drops, even if the battery is fully charged.
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Batteries may be hot after use. Observe due caution when removing
batteries from the camera.
Charge Batteries Before Use
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Charge the battery before use. The supplied battery is not fully charged at
shipment.
Ready Spare Batteries
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Before taking photographs, ready a spare battery and keep it fully
charged. Depending on your location, it may be difficult to purchase
replacement batteries on short notice.
Caring for the Camera and Battery: Cautions
748