I have a Neo and the RC-N3 controller. When the RC-N3 is plugged into the phone the RC-N3 battery drains pretty fast to charge the attached phone. The phone has plenty of battery power so, I don't want RC-N3 to charge the phone. I have not found a way to stop that.

Some phones can configure the USB for charging/data or both. This phone does not appear to have that option.

Typically, after a flying session the phone is 100% and the RC-N3 is down to 2 lights.

I did notice the phone had Quick Charge for USB turned on. I disabled that, which should reduce the amount of power drawn from the RC-N3 over a given time period.

The simplest way is adding a resistor to the vcc cable, it lowers the ampere so the phone won't charge, the other option is a diode

Hi there! We are sorry for the inconvenience caused. The DJI RC-N3 remote controller charges a connected Android mobile device by default and cannot be turned off. However, you can choose to turn on or off the function when connecting to an iOS mobile device.

I followed the Zolly YT video and built a similar USB wire. It works. I can turn on and off the phone charge with a push bottom:

That photo was before I put shrink tubing on.

DJI Gamora Posted at 2-28 23:32
Hi there! We are sorry for the inconvenience caused. The DJI RC-N3 remote controller charges a connected Android mobile device by default and cannot be turned off. However, you can choose to turn on or off the function when connecting to an iOS mobile device.

DJI should provide an android cable that doesn't allow the phone to charge from the radio.

Darmie Posted at 3-11 05:28
DJI should provide an android cable that doesn't allow the phone to charge from the radio.

Thank you for bringing your concern regarding the Android cable to our attention. Your suggestions for an anti-charging cable have been noted and will be shared with our development team. We take all customer feedback seriously and use it to continuously improve our products and services.

Thank you for your support and understanding.