"Battery temperature is below 15 degree Celsius. Warm up the battery temperature to above 25 degree Celsius to ensure a safe flight."
The other day I was flying my DJI Phantom 4 Pro in January in Ohio, it was about 5ºF (-15ºC) and I got a error message that refused to let me take off. The batteries were stored in my car before use and was every bit of 5ºF (-15ºC).
After reading the error message, I put the batteries in my pocket for a while to let them warm up. Not sure what temperature they were after a few minutes, but I put them in my drone and the error message was gone. To be sure everything was alright, I let the drone hover in place for about a minute and sure enough no error came onto the screen.
I learned that the lower the temperature, the less 'strong' the battery becomes and can affect performance of the drone. While the cutoff is 15ºC and I let the battery warm up, I didn't notice any negative affect on performance. You may have different results at lower temperatures. If the battery can not maintain a normal operating temperature, it might be best to come back on a warmer day and not potentially crash your drone due to loss or reduction of power.
DJI has battery heaters for the Inspire series drones and for Phantom 3's. I haven't been able to find anything for Phantom 4 battery warmers.
The Inspire 2 batteries have heaters on them. Inspire 1 batteries can be warmed with the DJI battery warmer.
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