News !! I tested this :
I connected the DJI batery fully charged with two wires in the Power Pins inside the drone to outside of it.
Then i put the drone in a table and turn it on.
He was on with motors on, and in the phone camera app it said 99% battery.
After that i connect the wires to a 10 or 15 amperes battery, i measure the voltage in this big battery and it was 12.39volts, then i and let the drone alone with motors spinning, sometimes i take the remote control, hold the drone in the table and make the motors go up and left and right...
After 40 minutes in the phone i read 92% battery, after 60 minutes i read 83% battery, my spare battery was 12.35volts...
I disconnect the spare battery and measure the voltage in the wires there was 12.0 volts...
Then i connect again the wires to the extra battery, after 75 minutes percentage in the phone was 79% and i give up with no patience...
This 12volts battery is from APC UPS dont know if it as 10 or 15 amperes, its big and weights a lot, so its impossible to take it in the Drone.
I have a battery from my portable pc, it has 6,300 amperes with 11.7 amperes its very light and next time i connected in the Drone and fly with it and DJI battery.
There is only one thing that worry ! If the drone comes down to the ground ill be losing 1300euros after one month.
Best Regards,
NO17RW your coments are very interest !!!
Keep the Work !!
Paulo Lobo
Paulo, keep trying your stuff. You seem to enjoy doing it and may offer some new insights along the way.
Meanwhile, try to get your experiments into logic steps and know what your are experimenting with.
You said early on you did not know how much current the phantom draws. Paulo, without this info, your experiments are only as worthwhile as your guesses and slapping extra batteries on it. You need to know the basics to make improvements and you at this point have no idea how much current is drawn.
So here you add some battery and run on your desk at idle speed. You did not say if you had props on or off, but let's assume you had them on. Without knowing how much current is drawn during this function, your times of 1 hour, 2 hours, etc have no meaning.
If you learn the basics of what your experiments will do, you would know that running with props on your desk at idle most of the time with the standard battery or even with added batteries is easily calculatable so you only need to run the experiment to prove the calcs accurate.
Calcs would have shown you that idling on your desk pulls about 2 amps. Using only the 5200mah dji battery, IT WOULD HAVE RUN 2.6 HOURS! Paulo, that is 156 minutes. Since you added some more mah to the 5200 it would have run even longer than that. So to prove this with an experiment you would have had to let it run for longer than 156 minutes - you did not, so you proved nothing with that test.
Now if you let it hover in place in the air, you would have drawn about 12 amps. You then should be able to hover for about 30 minutes. If you rise and go forward/reverse, you would have pulled about 18 amps and so could predict around 18 minute flight time. Then you could experiment and prove this.
Then you can add your extra batteries and repeat the tests for direct comparison. Unfortunately I think you will find that the added weight adds almost identical higher current draw during hover and during flight, so you will see why the 5200mah was found as a sweet spot for this weight unit. It is called a snowball effect in engineering: in this case, add more mah capacity and its added weight uses up the gain with more load. it snowballs so if you end up adding the max weight possible, the added current draw keeps you right back at same flight time.
Until we get more mah per unit weight batteries, this will be true.
Will you find small ways to make small minutes gain? sure you will! but do not expect much if you understand what your are fighting and know your basics.
Please learn the basics so you do not waste your time but rather find those interesting tidbits that you are bound to learn and share with us!
I applaud you for your experiments and sharing with us! Keep going.