How to Discharge DJI Phantom 2 Battery

That being said, I've read on some forums that discharging the battery below 50% is not necessary and could cause damage to the battery. Also, given that the new firmware update automatically discharges a battery to ~50%, we can only assume that ~50% must be the proper discharge level.

As per the DJI Wiki Correct Battery Usage Notes:

1. Never plug or unplug the battery into the aircraft when it is powered on.
2. The battery should be charged in an environment that is between 0℃ to 40℃, and be discharged in an environment that is between -20℃ to 50℃. Both charging and discharging should be in an environment where the relative humidity is lower than 80%.
3. It’s recommended to charge and discharge the battery thoroughly once every 20 charge/discharge cycles. Users should discharge the battery until there is less than 8% power left or until the battery can no longer be turned on. Users should then fully recharge the battery to maximum capacity. This power cycling procedure will ensure the battery is working at its optimal level.
4. For long term storage please place the battery with only a 40~50% capacity in a strong battery box securely. We recommend discharging and charging the battery completely once every 3 months to keep it in good condition. The capacity should be varied in such a cycle 40%~50%—0%—100%—40%~50%.
5. It’s suggested you purchase a new battery after you have discharged your current battery over 300 times. Please completely discharge a battery prior to disposal.
6. It’s suggested that you purchase a new battery if the current battery is swollen or damaged in any way.
7. Never try to recharge or fly with a battery that is swollen or damaged in any way.
8. Never charge the battery unattended. Always charge the battery on a non-flammable surface such as concrete and never near any flammable materials.
9. Safety is extremely important and users can get more information in the DISCLAIMER."

Another thing you might be wondering is what do the Phantom 2 Battery LED indicators mean? See table below:

If you're like me, you've been searching the web looking for answers to this question.

Apparently there is a new firmware update available for the Phantom 2 "Smart" battery which will allow the battery to automatically begin a discharging process after 10 days without use. (FYI, the battery takes roughly 2 days to automatically discharge this way, and will discharge itself to about 50% power. Also any time the battery button is pressed, the 10 day countdown refreshes again.).

However, that being said, some people have said that DJI recalled this firmware update, so personally speaking I don't trust this as a viable solution.

So, what to do? As with all things DJI, since their customer service is so brutal all you can really do is scour the internet and be your own source of tech support. I discovered this helpful post in one of the forums. See answer below:

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