Battery mod thread

[Justinswidebody]

Switching to non dji battery mode isn't very hard if you have a little computer skills.

 

[Liamjason123]

I cant wait for a few tutorials on unlocking peramiters ive tried but failed lol

 

[XxRKDOxX]

I literally have a bms that I just plug batteries into whenever I want. No cells attached at all.

Wanna sell me one of these? lol

 

[Marcuchinonis]

Then, in n

You have to watch your actual voltage of cells. The mini will sometimes try a forced landing when you still have around 3.5volts per cell... You can stay in the air until it force lands you completely at 3.17volts.

By switching to non dji mode this gets eliminated and you can stay in the air until 2.5volts. However with the added weight the mini has a hard time even hovering after 3volts per cell.

Then, if you are in non dji battery mode, if you can fly until 2,5V, with only the stock battery, maybe you can fly about 30 min?

 

[Justinswidebody]

Then, in n

Then, if you are in non dji battery mode, if you can fly until 2,5V, with only the stock battery, maybe you can fly about 30 min?

Yes I can fly 30 min on stock battery

 

[Justinswidebody]

But anafi motors allow me to still have thrust at 2.5v where stock motors do not. So at 2.5v I still have usable power with Anafi motors.

 

[Marcuchinonis]

But anafi motors allow me to still have thrust at 2.5v where stock motors do not. So at 2.5v I still have usable power with Anafi motors.

Fantàstic. Have you shared Anafi tests anywhere?

 

[Justinswidebody]

Fantàstic. Have you shared Anafi tests anywhere?

What kind of test do you want to see?

 

[aeropic]

[QUOTE="Justinswidebody,
Do you think the 2 data lines are I2C or SPI data and clock lines ? If yes could we spy the bus to reverse ingeeneer the trafic ? The goal being to get rid of the stock BMS coding a kind of stub on a cheap microcontroler....
Well it's good to dream ?

I tried to attach a small logic analyzer to the Clock and data lines of the battery. I succeed decoding the I2C protocol but I'm afraid the step to reverse engineer it is HUGE ...

While not (yet) fried, I think I will stop here and go flying ;-)

 

[Justinswidebody]

I tried to attach a small logic analyzer to the Clock and data lines of the battery. I succeed decoding the I2C protocol but I'm afraid the step to reverse engineer it is HUGE ...

While not (yet) fried, I think I will stop here and go flying ;-)

So looks too difficult to achieve? Thanks for trying! Wish we had someone who could make a magic board

 

[sooXoo]

if the Chinese haven't succeeded in cloning and selling the BMS, it must be hard

 

[Justinswidebody]

There is someone who has made a bms, but he isn't sharing any details.

 

[sooXoo]

Guess, I missed it somehow... He's either a "good citizen" or already has some bigger plans. Those little boards would sell as hot cakes, at $10 a pop.

 

[exceptional]

Switching to non dji battery mode isn't very hard if you have a little computer skills.

On 01.00.0200 and 01.00.0300 firmwares it doesn't allow you to change battery_type to 0.

Error: this type has no size

 

[everBit]

Guess, I missed it somehow... He's either a "good citizen" or already has some bigger plans

It's 99% that he just reused genuine bms from another battery. Many people just recelling their batts with same or larger capacity cells to not to pay for overpriced DJI ones.

Cloning of new generation DJI's bms (DJI Mavic Air, Mavic 2 Pro, DJI Spark, Mini) at present moment not possible due to special cryptoalgorithm used in communication between Drone and battery which is still not broken.
While there are some knock-ff batteries on the market, they could be used in "non-dji battery" mode only otherwise Drone would not accept them to take-off.

It's continious cat-&-mouse game between OEM and counterfait makers as batteries are big piece of cheese but cats always one step forward because they set the rythm in this overture.

 

[aeropic]

So looks too difficult to achieve? Thanks for trying! Wish we had someone who could make a magic board

Yes, i think it would be really difficult... If only DJI could release the specifications of the BMS protocol...

 

[mavicn00b]

Can these batteries be re-celled with OTS Samsung 25Rs down the track when the battery wears out ( essentially avoiding DJI tax and re-using the BMS/case)?

 

[Justinswidebody]

Can these batteries be re-celled with OTS Samsung 25Rs down the track when the battery wears out ( essentially avoiding DJI tax and re-using the BMS/case)?

Only if you never did the initial battery update from the initial launched mavic mini.

 

[Justinswidebody]

Here's a 45 min hover test. I love the anafi motors and props!

 

[everBit]

Only if you never did the initial battery update from the initial launched mavic mini

Some people reported they did it successfully after battery firmware being updated, there is even video on youtube where Mavic Mini user replaced stock cells with Sony 3000mAh ones and did then hover testing.
In comments he confirmed Drone and battery both were updated just upon unboxing (otherwise it was not possible to take-off).