You gave me another brilliant idea!! Just use 2 DJI batteries.. but make a Disconnect between each 3 wires, SO you can charge both batteries separately!! I will do this, thanks!
I am happy that my video triggered some thought. I cannot say that I fully understood how you mean it. Maybe you want to do a video about it and make the community richer?! 😉
I think I understand. But note that once you charged a battery you HAVE to discharge it. You can not change the cells and charge another one. The electronics may think that the cell takes up too much charge so it must be faulty and it locks the battery.
That's pretty cool. I'm sure everyone already knows this but do not mix batter chemistries, and mix old and new batteries, or even battery from different batches if possible. For a lot of different reasons. But it's still an awesome mod
Very detailed, was the only place I was able to find the answer to which pads did what on the battery terminal. Middle two are positive, the two next to the positive on each side are negative. Thank you
I had the same question but with the battery of a Potensic Atom which is very similar to the DJI mini2. Thanks to your video, I was able to clear this doubt. Another discovery for me was about not disconnecting or short-circuiting the terminals of a smart battery, at the risk of permanently damaging it. I greatly appreciate your work and interest in knowing how things work. This is how we learn. Thank you very much!
Sweet video bro helped me alot I got two mini batteries I got cheap at bestbuy I use in my mini SE. Think they wanted get rid of the stock they had left. Wanted to mess with one of them to make something for a range extender for use with litchi way points for a security perimeter patrol around my property . I figure the extra weight is ok as I want it set at 110feet agl so not very high at all. I have hovering points in the track which gives me a really good flight time on the stock mini2 batteries. I just want more and more haha 😂
lipo and liion have very different way to deliver power they have to be charged equally like balanced bc if not lipo will try to level charge and with discharge rates being so different there could be battery damage.
@@SzyxYank all batteries are similar depending what are you looking at, lithium ion is a completely different chemistry than lithium polymer, so if by very similar the criteria is the word lithium in their name then yes, but we are considering charging and while charging the considerations are not even close… since diacharge rate? to chamce to get on fire, how efficient they are etc. dont want to sound like a hater but they are nothing close to each other
I use a floss threader to pull floss under bridges. It is a stiff piece of plastic with a loop in one end. I slipped it through with some waxed floss in the loop. It went around fairly easy, cutting the silicone and lubricated by the wax. Easier for me than hunting up a stiff wire and hooking thread through.
@@ZollyD awesome, i’m happy that i have a plan to upgrade one of the batteries if one will go bad, seems pretty easy, i’m curious to see the improvement on flight time on 3500mah batteries or the biggest you can get
Hello thank you for sharing that is great. how do you manage low voltage alarm as Li-on is 2.6v vs 3.3 for lipo? If you keep original setting lipo will be destroyed.or I have missed something.?
Good point, and you have not missed anything. You are totally right. :) That is why I use the rest of the videos only the Li-ion cells. And in the later videos if you really watch them I mention this somewhere.
@@ZollyD I flew yesterday and I have noticed that voltage alarm is 3.35 something like this. Which is the absolute limit for lipo but not for li-on. The pb is that we can't adjust le voltage by ourself
The drone just shuts the motor off when it says battery voltage low after you cut the balancing wire. Shouldn't it try to go home or land first? Or is it because the drone knows it's not actually flying
May I know what is the mAh of the original 18650 ? If I want to change the original 18650 to new 18650 with higher mAh for longer flight time, is this possible ?
also, the r25 have 2500 mah as i rember and the li po cells you are using might be 2.2Ah, and even tho you put the same li ion cells instead of li po , you have to consider discharging and charging the added li ion cells in order to see if they have similar capacity. li po have 3.7v nominal and li ion have 3.6v
Interesting...have u just tried using some Samsung 18650s inr 3000mah to 3500mah batteries...and not running the dual pack...just upgrading the mini2 pack.. I might buy some crap mini 1 batteries on eBay and try it....i ran 5500mah lipid on my mavic pro...with a RC adaptor for charging dji on a racing drone charger
It does not charge during flight. Even if it did the additional circuitry of the power bank adds too much weight and it provides too low charging current.
Very interesting project.would it be possible to bind the Mini gimbal after exchanging it with the mainboard without using the method given by dji and its software? so that the error message 40021 disappears
No idea. I am looking into the internal comm in the drones, but it is so encrypted I haven´t gotten too far with it yet. Once I have some valuable info I will for sure post it here! :)
That I have been also wondering myself! :) I have not found basically anything about the cells. They must be at least 15-20 Amps I believe! ANYONE with some better info?
Hi Zolly. I was wondering, why did you cut power from this BMS then go to all the trouble of modifying this board? Would it have worked to simply leave the Lipo cells and balance wire in place, solder in your Sony Murata VTC6 cells, then remove the Lipo cells?
Hi! If you mean to take the cells from a mavic 2 battery.. It is not advised. Not a great idea to mix the different lithium technologies as they have a different charge range and a very different discharge curve. What I showed in the video is just a demo. :)
Hi! I do not fully understand which parts do you want listed. Help me out here! :) Otherwise I am in progress doing the same mod on a Mini 2 and it will come soon! :) Cheers
@@ZollyD ok thanks I will wait it out for the mini 2 My problem is mini 2 range is amazing but battery makes me bring it home sooner Look forward to the mini 2 battery mod ❤️👍
Anyone on here know how to exceeded the hight limit on my CJS S189 PRO it's stuck at 120 mitres. Geofence blocker or something that disables my hight on app.
this is the video i was looking for but can you show the terminal where the balance wire is soldered into the pcb I'd like to replace my battery but like to keep it neat Great video man 👌
very smart to put 2s2p batteries in paralel one pack being li ion and the other li po, so smart, i assume u know they have different voltage and so different charging voltage, very smart man
If every step is followed exactly, I don´t see why it should not work. Basically the battery board will not even "realize" that anything was done. I have not tried it with a Mini 2 though. So this is my best educated guess. Hope this helped. :)
So DJI are making their batteries 'tamper proof' just to be able to sell over-priced batteries? That's not very consumer friendly and would qualify for a sour lesson... I've been thinking a little about developing and selling 'drop in replacement' PCB's for the most popular Mavic drones - like the CPU Boards, with a snapdragon without burned fuses, to make them 'great again' aka 'hacking friendly'. But I'm not sure if the costs will be reclaimable by support from the community... Also, I'm not sure how far they have gone to make their flying software to detect a cloned board. What du you think? 🤔
Cool stuff. I am happy to cooperate for the greatest good! I have to add, while I also disagree with some methods Dji uses to maximise profit. However I also undersand that modded batteries can be dangerous and Dji don't want to take the blame for any user error. I wish they would at least make it possible to buy an unlocked board from them with proper disclaimers and maybe even accepting that your drone loses warranty the day you purchase the unlocked battery.
No es tan fácil, para cambiarlas tienes que aguantarle el voltaje con un puente, bien a otra bateria o a una fuente que tenga exactamente el mismo voltaje en el momento, si el chip que lleva la placa detecta un cambio brusco se bloquea la placa y no le dará corriente al mavic, si has visto el video en español donde cambian las 18650 como comentas es un fake como una catedral, puesto que la persona del video hace un corte bastante brusco cuando la introduce en el dron y aparece con un cable de carga puesto, lo que pasa que se habla muy poco sobre el tema y ese video penso que le daría visitas. Te lo digo porque ya me cargado unas pocas y otras pocas salió bien.
Peace be upon you and God’s mercy. I have a question about the Mavik Pro Zoom plane. How many volts does it take for me? I want to buy a battery to increase the time, and I don’t know how many volts it is. I mean if I bought a battery, for example, 17 volts, would you bear the increase first? Thank you.
Thank you! I do not have a Mavic Pro, so I can´t answer your question with confidence. I believe (not sure) it is a 3S battery pack (Absolute max cahrge 13.2V). To put higher voltage than what the drone is designed for is risky. f I ever get my hands on a Mavic Pro series drone I will for sure post a video about my findings. Right now I can not be much help on this. If you have any progres please let us all know! :) Good Luck!
Thanks man, i enjoyed every minute of your video because I am a drone and electronic enthusiast. Well explained. Still my batteries are new but who knows when I have to that too. Can I put batteries with more amp? Or is there on the PCB board a limit check that controlls the amp? Anyone knows?
Thanks! :) On the Mavic Mini if I am correct you can just put higher capacity cells, it will be fine. Maybe you get the low battery warning earlier, but it will still fly. (I think) :)
I tried with acetone. It softens a bit with it. Heat does not effect it. Maybe it is not epoxy, but I doubt it is hot glue. Maybe some glue experts out there? 😅
Good morning, excuse me, but putting two 7.6 volt batteries adds up to 15.2 volts, that will leave the drone useless, it will burn the transistors because it does that.
Yes, the added battery is in parallel with the original one. It is true that the individual cells are connected in series. So it is a 2S2P configuration. I agree that the 15.2 volts would be unhealthy! 😂😂😂 I made a video with a 3S battery on the Mini though. Check it out if you feel like! :) th-cam.com/video/9vgUTs8XGs4/w-d-xo.html
Another crap video, you don't show full flight battery time, plus charging source with extra battery's would eventually burn out charge control through drone charge system, try adapting this to a onion !!
so why not just put battery that is 3500 mah in like they do with the battery mod for mini 2 in philipines ? can then have it back in the original case
👍🏼. Thank You !! BTW: Has anyone come up with a substitute battery for the Mavic-3 or Air-2s ? For Fire department / SAR use where we want to increase flight time by double or more… Thanks !
Your expertise is commendable.
Perfect. That thread solution was brilliant. That’s exactly what i was looking for when u came here.
You gave me another brilliant idea!! Just use 2 DJI batteries.. but make a Disconnect between each 3 wires, SO you can charge both batteries separately!! I will do this, thanks!
I am happy that my video triggered some thought. I cannot say that I fully understood how you mean it. Maybe you want to do a video about it and make the community richer?! 😉
@@ZollyD I'm talking about using 2 DJI batteries and putting male/female disconnects between the batteries.
I think I understand. But note that once you charged a battery you HAVE to discharge it. You can not change the cells and charge another one. The electronics may think that the cell takes up too much charge so it must be faulty and it locks the battery.
That's pretty cool. I'm sure everyone already knows this but do not mix batter chemistries, and mix old and new batteries, or even battery from different batches if possible. For a lot of different reasons. But it's still an awesome mod
The level of description and creative thinking. Wow great video!!
Thanks! :)
Very detailed, was the only place I was able to find the answer to which pads did what on the battery terminal. Middle two are positive, the two next to the positive on each side are negative. Thank you
Thanks! :)
I had the same question but with the battery of a Potensic Atom which is very similar to the DJI mini2.
Thanks to your video, I was able to clear this doubt.
Another discovery for me was about not disconnecting or short-circuiting the terminals of a smart battery, at the risk of permanently damaging it.
I greatly appreciate your work and interest in knowing how things work. This is how we learn. Thank you very much!
Köszi szépen Drusza! Nagyon hasznos volt!
Örulök! :)
Sweet video bro helped me alot I got two mini batteries I got cheap at bestbuy I use in my mini SE. Think they wanted get rid of the stock they had left. Wanted to mess with one of them to make something for a range extender for use with litchi way points for a security perimeter patrol around my property . I figure the extra weight is ok as I want it set at 110feet agl so not very high at all. I have hovering points in the track which gives me a really good flight time on the stock mini2 batteries. I just want more and more haha 😂
Wow man I am so glad that I found you! This is great stuff. Thank you so much for all you do
You are welcome! I am happy that you find it useful! :) Now it is yours too. ;)
Interesting video! Can't wait to see how you make the battery usable again. Big up.
Thanks! Yes, it is coming! :)
lipo and liion have very different way to deliver power they have to be charged equally like balanced bc if not lipo will try to level charge and with discharge rates being so different there could be battery damage.
Yes yes. Correct
i think lipo and lion are very similiar techology
18650s work great in a mini2...since such a low amp pull.. Some of my racing drones pull 160amps. Using 160c to 200c lipos
@@SzyxYank all batteries are similar depending what are you looking at, lithium ion is a completely different chemistry than lithium polymer, so if by very similar the criteria is the word lithium in their name then yes, but we are considering charging and while charging the considerations are not even close… since diacharge rate? to chamce to get on fire, how efficient they are etc. dont want to sound like a hater but they are nothing close to each other
I use a floss threader to pull floss under bridges. It is a stiff piece of plastic with a loop in one end. I slipped it through with some waxed floss in the loop. It went around fairly easy, cutting the silicone and lubricated by the wax. Easier for me than hunting up a stiff wire and hooking thread through.
Good idea! 🙂
Do you have dpark battery repair video ? Thanks
Nice tutorial, well done! 🙂👍
Thanks! :)
Congrats for this awesome video, top quality and explaining, i love it !!
Thanks! :) I am happy that you liked it. More to come!
@@ZollyD awesome, i’m happy that i have a plan to upgrade one of the batteries if one will go bad, seems pretty easy, i’m curious to see the improvement on flight time on 3500mah batteries or the biggest you can get
Hii thank you for share
So you connect the lipo in parallel because the pcb to remain powered when disconect the 18650. You trick the pcb😁
Brilliant In detail description! 🍾
Thanks! I am glad you liked it! 🙂
Sir can we use normal soldering instead of spot welding in batteries ??
Hi Zolly. Have you been able to replace the original battery cells with LiPo cells? I presume a different charger might be necessary
Teach me how to change the Mini 2's battery cells for more powerful ones.
For that you will need a software to unlock the battery, or you can use my other method of adding 2 extra cells to the battery.
Hello thank you for sharing that is great. how do you manage low voltage alarm as Li-on is 2.6v vs 3.3 for lipo? If you keep original setting lipo will be destroyed.or I have missed something.?
Good point, and you have not missed anything. You are totally right. :) That is why I use the rest of the videos only the Li-ion cells. And in the later videos if you really watch them I mention this somewhere.
@@ZollyD I flew yesterday and I have noticed that voltage alarm is 3.35 something like this. Which is the absolute limit for lipo but not for li-on. The pb is that we can't adjust le voltage by ourself
Best video on the topic!
Thanks! :)
Świetny poradnik. Nagraj ulepszenie baterii z Mini 3 Pro :) Pozdrawiam z Polski
The drone just shuts the motor off when it says battery voltage low after you cut the balancing wire. Shouldn't it try to go home or land first? Or is it because the drone knows it's not actually flying
Yes. It knows that it is not in flight, so it is safe to turn off the props.
Love this kind of stuff!
I love them too! :) Thanks
hello it turned out very cool tell me information about batteries
Very good!!!😊 oh what info do you need?
Make caps as kit so make own packs awesome work in subbed u brother
May I know what is the mAh of the original 18650 ? If I want to change the original 18650 to new 18650 with higher mAh for longer flight time, is this possible ?
2500 mAh
@@ZollyD many thanks.
👍
does it have battery is not suitable warning in dji fly app
Question, I ordered a soldering kit and I need to know if the lithium battery is rechargable
Nvm watched until the end, can you charge the battery with the lipo while it’s in the charging case?
Nvm it can, man I need to finish the video . This comment is resolved
I am glad you figured it out! :) Just ask if you have more questions.
also, the r25 have 2500 mah as i rember and the li po cells you are using might be 2.2Ah, and even tho you put the same li ion cells instead of li po , you have to consider discharging and charging the added li ion cells in order to see if they have similar capacity. li po have 3.7v nominal and li ion have 3.6v
Correct
Interesting...have u just tried using some Samsung 18650s inr 3000mah to 3500mah batteries...and not running the dual pack...just upgrading the mini2 pack.. I might buy some crap mini 1 batteries on eBay and try it....i ran 5500mah lipid on my mavic pro...with a RC adaptor for charging dji on a racing drone charger
Amazing tinning work
What is the max increment of mah battery capacity?
I am sorry. I do not understand your question. Help me out here! :)
Ceramic blades to avoid metal shorting?
Yeah! :)
Why can't you just connect the power bank on the charging port it will charge the battery or not?
It does not charge during flight. Even if it did the additional circuitry of the power bank adds too much weight and it provides too low charging current.
Very interesting project.would it be possible to bind the Mini gimbal after exchanging it with the mainboard without using the method given by dji and its software? so that the error message 40021 disappears
No idea. I am looking into the internal comm in the drones, but it is so encrypted I haven´t gotten too far with it yet. Once I have some valuable info I will for sure post it here! :)
Sir, what is the continuous discharge rate in amp does the original li-ion battery has?
That I have been also wondering myself! :) I have not found basically anything about the cells. They must be at least 15-20 Amps I believe! ANYONE with some better info?
@@ZollyD Ok thanks and best of luck for your future projects.
Thank you! :) If I get to know anything about these cells or good replacements for them I will for sure inform all of you in a future video!
moded baterry can be used in mini2 ?
Yes! I will do a video on that soon! :) ;)
Hi Zolly. I was wondering, why did you cut power from this BMS then go to all the trouble of modifying this board? Would it have worked to simply leave the Lipo cells and balance wire in place, solder in your Sony Murata VTC6 cells, then remove the Lipo cells?
Hello, can we use mavic 2 battery to mavic mini?
Hi! If you mean to take the cells from a mavic 2 battery.. It is not advised. Not a great idea to mix the different lithium technologies as they have a different charge range and a very different discharge curve. What I showed in the video is just a demo. :)
Tnx a lot
привет друг подойдет этот вариант для dji mini 2 \ дата выпуска 2022 год .
Mavic mini battery indicator last 2 same time 3 time blinking. Help me
nice! i have mini2 and you are very helpfull!
Thanks! :) I am glad to hear!
Oh wow, that is pretty interesting. Please continue!
Thanks! The new video is out. Check it here th-cam.com/video/lnZyM3plN9Y/w-d-xo.html
:)
Can you list the parts please I would like to do this for the mini 2
Hi!
I do not fully understand which parts do you want listed. Help me out here! :)
Otherwise I am in progress doing the same mod on a Mini 2 and it will come soon! :) Cheers
@@ZollyD ok thanks I will wait it out for the mini 2
My problem is mini 2 range is amazing but battery makes me bring it home sooner
Look forward to the mini 2 battery mod ❤️👍
Anyone on here know how to exceeded the hight limit on my CJS S189 PRO it's stuck at 120 mitres. Geofence blocker or something that disables my hight on app.
Thanks for sharing love your hacks.
Thanks for the support!
you are a genius! 🤗 does it affects the GPS module?
Can’t wait mod for dji spark
If I get my hands on a Spark I will for sure do my best to hack it!:)
Please do dji spark👍👍👍
this is the video i was looking for
but can you show the terminal where the balance wire is soldered into the pcb
I'd like to replace my battery but like to keep it neat
Great video man 👌
Thanks! :)
Can you please show how to modify mavic air 2 battery charging hub series charging into simultaneous charging mod?
Hi!
I do not have the Air2, so I do not have the chance to experiment with it...
Hi Sir, can you please try mavic air please 🙏
As soon as I have access to a Mavic Air I will for sure try my best. :) As of now I do not have one...
@@ZollyD thanks 😊
Help !
I have 4 LEDs blinking 3 Times per second
Boa Noite
Passando para prestigiar aquele super like ✌
Thanks! :)
very smart to put 2s2p batteries in paralel one pack being li ion and the other li po, so smart, i assume u know they have different voltage and so different charging voltage, very smart man
Thx
Just wish there was space to swap in some 21700 cells.
Me too
i would like to know if it works for mini 2 ,,, not mavic
thank you
If every step is followed exactly, I don´t see why it should not work. Basically the battery board will not even "realize" that anything was done.
I have not tried it with a Mini 2 though. So this is my best educated guess. Hope this helped. :)
mavic mini 1 batteries can be used for the mini 2...i use them that way
Nice one!
Excellent
amazing! thanks!
You are welcome! :)
So DJI are making their batteries 'tamper proof' just to be able to sell over-priced batteries?
That's not very consumer friendly and would qualify for a sour lesson...
I've been thinking a little about developing and selling 'drop in replacement' PCB's for the most popular Mavic drones - like the CPU Boards, with a snapdragon without burned fuses, to make them 'great again' aka 'hacking friendly'. But I'm not sure if the costs will be reclaimable by support from the community...
Also, I'm not sure how far they have gone to make their flying software to detect a cloned board.
What du you think? 🤔
Cool stuff. I am happy to cooperate for the greatest good! I have to add, while I also disagree with some methods Dji uses to maximise profit. However I also undersand that modded batteries can be dangerous and Dji don't want to take the blame for any user error. I wish they would at least make it possible to buy an unlocked board from them with proper disclaimers and maybe even accepting that your drone loses warranty the day you purchase the unlocked battery.
good job my friend
Thanks! :)
hay baterias 16850 que trae el dron con mas amperaje y no hay que liar todo ese follon, cambiar unas por otras y listo.
No es tan fácil, para cambiarlas tienes que aguantarle el voltaje con un puente, bien a otra bateria o a una fuente que tenga exactamente el mismo voltaje en el momento, si el chip que lleva la placa detecta un cambio brusco se bloquea la placa y no le dará corriente al mavic, si has visto el video en español donde cambian las 18650 como comentas es un fake como una catedral, puesto que la persona del video hace un corte bastante brusco cuando la introduce en el dron y aparece con un cable de carga puesto, lo que pasa que se habla muy poco sobre el tema y ese video penso que le daría visitas. Te lo digo porque ya me cargado unas pocas y otras pocas salió bien.
Dji tello drone extra battery ues video please
If I get my hands on one I will do my best! :)
Wow amazing
Thanks! :)
You're doing this for what again 🤔🙄
Testing and hacking stuff!
Very interesting
I am glad you liked it.
What you do has no effect. to the battery
If you say so... :)
@@ZollyD recommend B0b.
Yeah I know B0B. It is good. But I prefer the channel 'The Longranger'. his TRB software is the ultimate. ;)
Appreciate it.
Excellent!
Thanks! :)
Peace be upon you and God’s mercy. I have a question about the Mavik Pro Zoom plane. How many volts does it take for me? I want to buy a battery to increase the time, and I don’t know how many volts it is. I mean if I bought a battery, for example, 17 volts, would you bear the increase first? Thank you.
Thank you! I do not have a Mavic Pro, so I can´t answer your question with confidence. I believe (not sure) it is a 3S battery pack (Absolute max cahrge 13.2V). To put higher voltage than what the drone is designed for is risky. f I ever get my hands on a Mavic Pro series drone I will for sure post a video about my findings. Right now I can not be much help on this. If you have any progres please let us all know! :) Good Luck!
Thanks man, i enjoyed every minute of your video because I am a drone and electronic enthusiast. Well explained. Still my batteries are new but who knows when I have to that too. Can I put batteries with more amp? Or is there on the PCB board a limit check that controlls the amp? Anyone knows?
Thanks! :) On the Mavic Mini if I am correct you can just put higher capacity cells, it will be fine. Maybe you get the low battery warning earlier, but it will still fly. (I think) :)
Nice
why not just replace those original batteries that are 1200mAh each with new ones that are 3000mAh each?
Hi!
I just did that in this video th-cam.com/video/H4JPF_8zTqc/w-d-xo.html
at 12:25
:)
nice
Coolio.
for the original battery I have a 25 min flight time...
So how much time does this mode add?
It depends on the added cell. I will do more testing. :)
@@ZollyD cause this is what I was looking for. To extend the air time.
@@ZollyD I have the mini 2 and the mini batteries are better than the mini 2
Mini is compatible with the mini 2 but not vice versa
🇷🇺👋😁👍 I want to do that too
:)
That might be hot glue instead of epoxy. IF it's hot glue, dab some alcohol on the glue and after a 30 seconds or so, it will just pull off.
I tried with acetone. It softens a bit with it. Heat does not effect it. Maybe it is not epoxy, but I doubt it is hot glue. Maybe some glue experts out there? 😅
instead of giving the drone plus weight and disassembling the battery, i've just ordered another one....good video though...zolly rig everything
I got your point! :) And I see from your last 3 words that you got mine too ;)
I done it before, its not really work, pls change 3000 samsung battery mod.
Good morning, excuse me, but putting two 7.6 volt batteries adds up to 15.2 volts, that will leave the drone useless, it will burn the transistors because it does that.
parallel, not series.
Yes, the added battery is in parallel with the original one. It is true that the individual cells are connected in series. So it is a 2S2P configuration. I agree that the 15.2 volts would be unhealthy! 😂😂😂 I made a video with a 3S battery on the Mini though. Check it out if you feel like! :) th-cam.com/video/9vgUTs8XGs4/w-d-xo.html
Another crap video, you don't show full flight battery time, plus charging source with extra battery's would eventually burn out charge control through drone charge system, try adapting this to a onion !!
:D watch all my videos and learn some electronics! :D
so why not just put battery that is 3500 mah in like they do with the battery mod for mini 2 in philipines ? can then have it back in the original case
👍🏼. Thank You !!
BTW: Has anyone come up with a substitute battery for the Mavic-3 or Air-2s ?
For Fire department / SAR use where we want to increase flight time by double or more…
Thanks !