I just got back from CES where I had two separate conversations with DJI about the 1.5 firmware, and the mid-flight battery shut down issues being reported.
Battery shut downs are only a problem with the 1.5 firmware. 1.4 did not have the problem, nor any firmware before 1.4. It's important to know 1.6 solved this critical problem. That's why 1.5 was replaced so quickly with 1.6. So if you're using 1.5, DON'T FLY again until you either go back to 1.4, or move up to 1.6. After these conversations I had with DJI, I deem 1.5 as the kiss of death, so just don't fly it!
These "falling from the sky" reports are coming from the 1.5 Phantom firmware, NOT the battery firmware. The 1.5 Phantom firmware misreads the voltage levels from the battery, simply as that. However the display does show the right voltage and % level. The 1.5 firmware misreads the battery below 3.0V , which triggers battery protection, which shuts down the motors mid-flight. Again, this was not a problem in the battery firmware, it was solely a Phantom firmware problem. If you recall there was no battery firmware update in 1.5, however the shutdown problems started with 1.5, which proves the Phantom 1.5 firmware is what introduced this flaw. In 1.5, although you may see 60% battery level in your display, and you really do have 60% battery (an accurate reading), the firmware does not see that same battery level, it mistakenly sees a lower voltage, sometimes causing sudden power shutdown (battery protection). The 1.5 firmware is critically flawed. It misinterprets battery level, lower than reality, hence battery protection kicks in and turns off the power when your battery is at 40 to 60%.
By the way, when I state 1.6 firmware, that's the rev# for the ALL IN ONE .bin file you would download fro DJI. The actual rev of the RC firmware that you'll see is in the "About" section of the RC is 1.5.7.00, after loading the 1.6 package. That's what everyone needs, or stay on 1.4 (AKA drifter). Just don't use 1.5.