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Thank you for your inquiry. The EcoFlow DELTA 3 Ultra does not feature a dedicated battery heater. The unit's operating temperature specifications are as follows: Discharge Temperature: -10°C to 45°C (14°F to 113°F) Charge Temperature: 0°C to 45°C (32°F to 113°F) Optimal Operating Temperature: 20°C to 30°C (68°F to 86°F) Storage Temperature: -10°C to 45°C (14°F to 113°F), with an optimal storage temperature of 20°C to 30°C (68°F to 86°F) For best performance and battery longevity, we recommend operating and storing the unit within the optimal temperature range whenever possible.
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