Dual Battery Mod

[Ed209]

Always appreciate some knowledge man, I'm still learning and need that! Did you find that the lower rated batteries drew from the external at the same rate as the others? I was worried that it wouldn't distribute evenly and would leave too much in the tank. Thoughts?

Nope, as long as the cells can handle the load put on them, they all discharged evenly. Like I said, even though the C rating was way low, they were fine since I was running the DJI battery with them...Depending on the configuration, I tested 1 or 2 externals in parallel in addition to the DJI battery. That's 8-12 cells! It really whacks down the draw on each pack... That's why the DJI battery hardly heats up when running externals

 

[shockwave199]

here's a video i did on how to take the dji battery to 100%

Basically, turn it on so its powered on then plug it in. It will charge the rest of the way.

I haven't been able to get any of my batteries to behave like that. Once they're fully charged, they do not take a further charge using your method. Just saying.

 

[maxwell smart]

I haven't been able to get any of my batteries to behave like that. Once they're fully charged, they do not take a further charge using your method. Just saying.

I have two chargers, and only one will do the final charge.
I dont know why this is.

 

[Digdat0]

I have two chargers, and only one will do the final charge.
I dont know why this is.

Are both 60w or is one. 100w?

 

[Digdat0]

I haven't been able to get any of my batteries to behave like that. Once they're fully charged, they do not take a further charge using your method. Just saying.

What watt charger do you have? I can do this on all of my batteries, even the third party ones.

 

[Digdat0]

hey maxwell smart - how is your dual battery mod working out? Have you had any issues with a 2nd DJI battery turning off or anything? Or does it all seem to be working okay?

 

[tml4191]

For those of you looking to purchase a multistar battery off of hobbyking's site...check this out before purchasing:

Discount Hack? Hobbyking website Multistar= $5 dollars off Battery

 

[shockwave199]

What watt charger do you have? I can do this on all of my batteries, even the third party ones.

I have both the 60 and 100w dji chargers but I always use the 100w one. That makes a difference?

 

[Blitz]

Her are my findings, I guess not such a big surprise for most of you....did a hovering test with:

- P3Pv1: Dji-Battery at 17.18V: 18:45min
- P3Pv2: Dji battery at 17.2V: 20 min

Both additionally with the same Multistar LIHV4s5200 and Dji Batt at 17.2V:

-P3Pv1: 28min, feels veey snappy, enough muscle for this weight. Motors stayed absolutely cool. Barely warmed up
-P3Pv2: 30:15min, feels a bit less strong overall. Motor got warm, not hot, maybe 45 degree, you could touch them but remarkably warm for sure. The windings inside look as well a bit more messy than the v1 motor, I would not guessed that v2 is better quality, but v1 from a visual ispection....nevertheless: They hover longer.

Next test is if longer hover translates into longer distance at the same speed of approx. 10m/s....I am thinking currently that in strong winds I would be more confident to fly the v1...has more power-reserves...

 

[chazz]

Her are my findings, I guess not such a big surprise for most of you....did a hovering test with:

- P3Pv1: Dji-Battery at 17.18V: 18:45min
- P3Pv2: Dji battery at 17.2V: 20 min

Both additionally with the same Multistar LIHV4s5200 and Dji Batt at 17.2V:

-P3Pv1: 28min, feels veey snappy, enough muscle for this weight. Motors stayed absolutely cool. Barely warmed up
-P3Pv2: 30:15min, feels a bit less strong overall. Motor got warm, not hot, maybe 45 degree, you could touch them but remarkably warm for sure. The windings inside look as well a bit more messy than the v1 motor, I would not guessed that v2 is better quality, but v1 from a visual ispection....nevertheless: They hover longer.

Next test is if longer hover translates into longer distance at the same speed of approx. 10m/s....I am thinking currently that in strong winds I would be more confident to fly the v1...has more power-reserves...

Excuse my ignorance here but what are you referring to? P3Pv1 vs. P3Pv2? I may have missed something in a previous post that you're referencing and I apologize if that is the case but you peaked my curiosity with the 2 extra minutes on the P3Pv2...

Edit...Oh okay, I think you are referring to the two different version ps3's..With different motors...you must have both...

 

[chazz]

Speaking of motors has anyone tried these? KDEPSK-2315-885 Multi-Rotor Power System Kit for DJI™ Phantom® 3 Series

 

[Procharged97]

Speaking of motors has anyone tried these? KDEPSK-2315-885 Multi-Rotor Power System Kit for DJI[emoji769] Phantom[emoji768] 3 Series

Dig has/had them on one of his birds. Some people have had great results while others said its not worth it.

Sent from my SM-G900V using PhantomPilots mobile app

 

[chazz]

Thanks Pro...For $200 + I think I'd wait for a clear advantage before I'd purchase them.

 

[Blitz]

Yes, when the P3P was available on ebay for 550 Euro, I got the v2 with 2312a Motor...

 

[maxwell smart]

hey maxwell smart - how is your dual battery mod working out? Have you had any issues with a 2nd DJI battery turning off or anything? Or does it all seem to be working okay?

No problems. All works well, just scared it mite flip over when coming of full throttle.

 

[KMjelle]

Next test is if longer hover translates into longer distance at the same speed of approx. 10m/s....I am thinking currently that in strong winds I would be more confident to fly the v1...has more power-reserves...

I work as a volunteer in the Norwegian Alpine rescue service. We fly a lot with the Seaking rescue helicopter.
The pilots always have to use more torque/power to hower still mid air, than when flying forwards. Power difference is at least 30-40%. Would the same apply to our drones?

 

[Blitz]

In theory, yes...as well simulations would confirm that (see ecalc.ch)...but in practise the hoover time of 18:30 is as well sofar my best flighttime with only one battery...what matters is for sure a very battery-friendly start, so max 1,5m/s ascending and 6-8m/s moving horizontally. A smooth start gives you 30sec back and a smart landing where you loose height continously while moving horizontally as well as the battery get some power back from the regenerative bracking...

 

[Digdat0]

so i was modding two new batteries today, and saw a circuit board i havent seen before. i was curious if anyone else who has modded a battery has seen this? its the battery with the green circuit board inside.

 

[CleethorpesKid]

You can make these...really easy but takes time

Sent from my SM-G900V using PhantomPilots mobile app

What thickness copper did you use please?

 

[tml4191]

What thickness copper did you use please?

On that note, did you ever get a battery error with this mod. I remember flying the phantom at the beach and then I got a battery error since the battery wasn't plugged in all the way. It was in but slightly out, so how does this mod hold up?