Mavic Pro Battery Mod

lolo780 · Jan 10, 2018

chazz said:
Why doesn't your cell voltage match the total voltage?

The DJI battery cells aren't connected to the aircraft as this board is bricked. I'm only using it for the OSD voltage.

chazz · Jan 10, 2018

oh ok so you have the bricked board plugged into the mav with nothing connected to it and the external plugged into the one of the leads you added coming from esc board?

lolo780 · Jan 10, 2018

Yes. I'm not eager to brick a good battery so not sure how to precede from here. Ideally would like to have percentage and mAh counter of course, but having voltage would be workable.

chazz · Jan 10, 2018

lolo780 said:
Yes. I'm not eager to brick a good battery so not sure how to precede from here. Ideally would like to have percentage and mAh counter of course, but having voltage would be workable.

Agreed... i guess i got lucky on the first one and never had to do it again. it gives everything but mah.
I found this "g_raw.battery_info.design_capacity_0" and "g_raw.battery_info.full_charge_capacity_0" in the go app config file and i thought i was going to be able to change the mah but it didn't work.

rcbanme · Jan 11, 2018

Hi guys! This is my new ideal for mod no need opening mavic!

Phxbird57 · Jan 11, 2018

rcbanme said:
Hi guys! This is my new ideal for mod no need opening mavic!

Am I missing something. you have parts from an old battery for a mavic and ?

CyberNate · Jan 11, 2018

So I decided to brute force it to the distance limit today. Strapped on 3 Proteks and just powered out there with stock Mavic and Platinum propellers. 58,820ft out and back. I'll post up the video later.

Here is video. The signal with 4Hawks XR panel is awesome when boosted. I had some big interference from those high tension power lines I flew over, but once I got far enough away, signal came back strong!

SkyNinja · Jan 11, 2018

CyberNate said:
So I decided to brute force it to the distance limit today. Strapped on 3 Proteks and just powered out there with stock Mavic and Platinum propellers. 58,820ft out and back. I'll post up the video later.

Here is video. The signal with 4Hawks XR panel is awesome when boosted. I had some big interference from those high tension power lines I flew over, but once I got far enough away, signal came back strong!

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Great flight and video!

chazz · Jan 11, 2018

Nice flight CyberNate! Thanks for sharing that. It's the first video i saw that showed the limit problem. looks like 58730ft is the limit.

CyberNate · Jan 11, 2018

chazz said:
Nice flight CyberNate! Thanks for sharing that. It's the first video i saw that showed the limit problem. looks like 58730ft is the limit.

Yes, I didn't try any tricks for coasting and I also stood many feet behind my launch point. If I had walked forward a bit I could get some more distance. I don't want to play those games. Limit is limit. I am glad that Lolo has the record. He certainly has earned it.

CyberNate · Jan 11, 2018

Regarding hard limit, you can see that it is the RC signal that is cut. It goes out first. You need 2 way to maintain connection. This seems to be a controller issue. The radio service resets.

chazz · Jan 11, 2018

are you saying if you walked forward a little more it would have gone farther before hitting the limit? Isn't it 58730 ft from the home point?

CyberNate · Jan 11, 2018

chazz said:
are you saying if you walked forward a little more it would have gone farther before hitting the limit? Isn't it 58730 ft from the home point?

If you walk forward, the Mavic will go that much farther forward before limit. If you move backward, the limit will be hit sooner. Somehow the controller knows how far it is from Mavic, even with no GPS on controller side. I've tried spoofing location, doesn't help.

chazz · Jan 11, 2018

CyberNate said:
Regarding hard limit, you can see that it is the RC signal that is cut. It goes out first. You need 2 way to maintain connection. This seems to be a controller issue. The radio service resets.

Did anyone ever look in the rc firmware. Is there a place to find it extracted into its "modules" like the phantom firmware was. Does it have a config file?

CyberNate · Jan 11, 2018

chazz said:
Did anyone ever look in the rc firmware. Is there a place to find it extracted into its "modules" like the phantom firmware was. Does it have a config file?

Opened up an incident on Slack, but no one has made progress so far. I'm not sure how much effort has been put into it. I haven't dug into it much either.

Phxbird57 · Jan 11, 2018

CyberNate said:
So I decided to brute force it to the distance limit today. Strapped on 3 Proteks and just powered out there with stock Mavic and Platinum propellers. 58,820ft out and back. I'll post up the video later.

Here is video. The signal with 4Hawks XR panel is awesome when boosted. I had some big interference from those high tension power lines I flew over, but once I got far enough away, signal came back strong!

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

wow what a video. compared to my video at 30k I've pasted 3 roads you maybe 60.
Great Job.

dsd317 · Jan 11, 2018

CyberNate said:
So I decided to brute force it to the distance limit today. Strapped on 3 Proteks and just powered out there with stock Mavic and Platinum propellers. 58,820ft out and back. I'll post up the video later.

Here is video. The signal with 4Hawks XR panel is awesome when boosted. I had some big interference from those high tension power lines I flew over, but once I got far enough away, signal came back strong!

To view this content we will need your consent to set third party cookies.
For more detailed information, see our cookies page.

Awesome and congrats! I'm guessing that starting from an elevated location (compared to flight route) also helps with signal performance. That's what I need to fly to locations in my area. Houston is so flat that the only way to start from above trees, buildings, etc., is to go on top of a building.

I like how you had great signal performance with the altitude you flew at. Can you give more info on your 4Hawks XR setup?

CyberNate · Jan 11, 2018

dsd317 said:
Awesome and congrats! I'm guessing that starting from an elevated location (compared to flight route) also helps with signal performance. That's what I need to fly to locations in my area. Houston is so flat that the only way to start from above trees, buildings, etc., is to go on top of a building.

I like how you had great signal performance with the altitude you flew at. Can you give more info on your 4Hawks XR setup?

It just the 4hawks XR kit designed for Mavic and spark with sunhams 3w 2.4ghz boosters. You can get the cheap dragon 4w boosters that are just as good or better like these:

Wifi Signal Booster 2.4Ghz 4W 802.11 Signal Extender Wifi Repeater Broadband Amplifiers for Wireless Router, with 5dBi Antenna https://www.amazon.com/dp/B01B94U438/ref=cm_sw_r_cp_apa_ebdwAbND258ZG

CyberNate · Jan 12, 2018

In case anyone wants to try 3 protek batteries, here's some pictures. Use XT30 connectors to save weight. Gaffers tape to make battery belt and dual lock to attach side batteries. Works great. The low profile dimensions help minimize drag and propeller blockage.

dirtybum · Jan 12, 2018

CyberNate said:
In case anyone wants to try 3 protek batteries, here's some pictures. Use XT30 connectors to save weight. Gaffers tape to make battery belt and dual lock to attach side batteries. Works great. The low profile dimensions help minimize drag and propeller blockage.

So when you use the three externals does that mean no main DJI battery on top? It was originally reported that the Mavic doesn't do very well with that much external weight using the platinum props, I guess that's simply not true?