I recently picked up a DJI Spark and have been experiencing something rapid battery drain on my phone. A typical 8-10 minute flight seems to use up 25-50% of the phone's battery, which seems pretty excessive. I use it with the Spark remote and an iPhone 6s with a recently replaced battery, and it's been in the 40s (Fahrenheit) out. Most of the related posts on the DJI forums seem to suggest either an old battery, which isn't the case, or cold temperatures. I am leaning toward the latter, although low-to-mid-40s doesn't seem excessively cold. Has anyone else experienced this? Do I just need to wait until it is warmer out, or does it sound like something else may be going on?