Princes FPV Drones Project (July 2025)

Imagine my surprise!

My first discovery of a BMS that allowed the DJI FPV drone to start up!

Then I discovered another BMS board that also allow the drone to fly!

I devised a mounting system for the BMS board by utilizing the back of one of the DJI Battery cases. Then, a 3D-printed cage was created to secure the battery, and the BMS board was zip-tied into the retrofitted case, attaching it to the cage.

Front side of the modified case.

Backside of the modified case.

I utilized a SMC 1400mAh battery, perfect size to fit in the drones 3D printed case.

Perfect dimensions to fit in the 3D printed cage!

Everything matched up perfectly!

Following that I conducted a hover test and to my shear amazement that worked!

Finally, a battery upgrade that extends flight time!

The featured BMS board was removed from a dead Original DJI battery No changes were made to the board I discovered it is compatible with all 6s batteries and not only powers on but allows me to take off!

Battery that works for this upgrade!

SMC 1400mAh-FPV battery

Before testing flight times, we need to establish a base to compare from. We will be using a completely stock DJI FPV drone with no modifications to the physical configuration or software. We will be using the stock DJI FPV drone battery, which is fully charged and has fewer than 10 cycles. We will be cruising around in Normal mode with zero wind. We will be recording the weight of each configuration as weight affects flight time.

12 minutes

20% battery left

Normal mode DJI FPV Drone

Original DJI 2000mAh battery: 280 grams

DJI FPV Drone with stock battery: 784 grams

Testing DJI FPV STOCK Drone DJI Battery (7-13-2025)

Hover Test Results

5 minutes with

Upgraded DJI FPV drone

45% remaining on original DJI battery

3.7 volts per cell

Increased prop size and mounting the Hero Bones 10

Total: 915 grams (with battery)

8 minutes with

Upgraded DJI FPV drone

45% remaining on 1400 SMC Lipo battery

3.7 volts per cell Upgraded FPV drone

Increased prop size and mounting the Hero Bones 10

Total: 912 grams (with battery)

8 minutes with

Stock DJI FPV Drone

45% remaining on original DJI battery

3.7 volts per cell

Total: 791 grams (with battery)

9 minutes with

Stock DJI FPV Drone

45% remaining on 1400 SMC Lipo battery

3.7 volts per cell

Total: 794 grams (with battery)

DJI FPV Drone battery mod extended flight time! (5-30-2025)

Then it was time for some flying in the field and there were no issues!

Stock DJI FPV drone

SPORTS mode

FPV Drone Without battery: 508 grams

6:30 minutes

45% remaining

1400mah SMC battery: 296 grams

Stock DJI Battery: 288 grams

Total: 794 grams (with battery)

DJI FPV Drone battery mod, 6:30 minute flight! (6-01-2025)