Revolectrix "HV" LiPos - Page 3 - RC Groups
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Mar 23, 2015, 06:07 PM
Revolectrix Ambassador
The cell voltage will drop during discharge, so a static number volts cannot be used for such a calculation. Additionally, 4.35v is the cells peak voltage during charge not its nominal voltage ala 3.7v for traditional LiPo.

But there is an underlying grain of truth, which is a higher voltage for the same mah provides more energy density. Convert to watt hours to see the difference.
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Mar 24, 2015, 04:27 AM
Registered User
ggcrandall1's Avatar
Quote:
Originally Posted by bonefishfool
Hey, another question for the group- maybe Gregor can answer this one as well. As I look at this new HV battery deal, I am gaining over a cell basically going with these batteries. Tell me if I am incorrect here;
Standard 4S battery = 3.7 x 4 = 14.8 volts (S/B 4.20 x 4 = 16.8V)
HV battery = 4.35 x 4 = 17.4 volts
17.4 - 14.8 = 2.6 volts (S/B 17.4 - 16.8 = .6 volts)
2.6/3.7 = 0.7
So, in my feeble mind, I am gaining the equivalent of 70 per cent of an additional cell.
Accordingly, if I run 2 cells in series for 8S, I would be gaining and additional 1.4 cell equivalents. Is this thinking correct? Almost getting something for nothing as the HV cells quoted weight would be the same in an 8S setup as the single nanotech 8S I am now running ( less connector). Sounds too good to be true, but I can see that a change in battery chemistry might allow this to be reality.
Inquiring minds want to know !!
Glen
Mar 31, 2015, 11:55 AM
Addicted
Parakos's Avatar
Anyone knows how a 12S ESC will cope with the higher voltage? My Jeti ESC is rated to 51V, but 12*4.27=51.24V.

I'm sure the voltage will be somewhere around 50,8V when you plug the batteries in, but I just want to be sure.
Last edited by Parakos; Mar 31, 2015 at 12:59 PM.
Mar 31, 2015, 01:10 PM
Revolectrix Ambassador
Quote:
Originally Posted by Parakos
Anyone knows how a 12S ESC will cope with the higher voltage? My Jeti ESC is rated to 51V, but 12*4.27=51.24V.

I'm sure the voltage will be somewhere around 50,8V when you plug the batteries in, but I just want to be sure.
That's a good question for Jeti. Likely the answer may vary depending the ESC and HV blend packs in use. Currently there are the 4.27v, 4.35v and the 4.55v are in the works. You definitely want the manufacture's buyoff before testing or exceeding the upper limits of the ESC's input voltage.
Mar 31, 2015, 02:02 PM
Registered User
ggcrandall1's Avatar
Quote:
Originally Posted by Parakos
Anyone knows how a 12S ESC will cope with the higher voltage? My Jeti ESC is rated to 51V, but 12*4.27=51.24V.

I'm sure the voltage will be somewhere around 50,8V when you plug the batteries in, but I just want to be sure.
Manufacturers specifications are at least 25% under rated so I doubt that exceeding the 51V spec by .24V is going to cause a problem.

Glen
Apr 01, 2015, 07:04 PM
Revolectrix Ambassador
Quote:
Originally Posted by ggcrandall1
Manufacturers specifications are at least 25% under rated so I doubt that exceeding the 51V spec by .24V is going to cause a problem.

Glen
Yes, but don't tell Jeti Glen said it was OK
Apr 04, 2015, 09:12 AM
Registered User
hbollier's Avatar
I just got my first set of 435 blend batteries. I am running them 12S through a Castle Creations HV ESC. I emailed Castle for their OK before I did it. I have the 6S 4600 30C and they were holding over 3.85 v/cell at 70 amps.

Questions for RevoJohn: 1) With normal lipo we usually try to stay above 3.7 V/ cell, is this the same with the 435 blend? 2) Will a lower terminal charge voltage increase cycle life? I.e should I charge to 4.3 or lower to increase the life of the battery at the expense of flight time?
Apr 05, 2015, 03:32 AM
REVOJohn's Avatar
see our FAQ section ar revoblends.com but.........
treat them same as normal lipo and yes if you dont charge to higher V they will last u longer but you will have lower capacity available
Apr 05, 2015, 10:38 AM
Registered User
hbollier's Avatar
Quote:
Originally Posted by REVOJohn
see our FAQ section ar revoblends.com but.........
treat them same as normal lipo and yes if you dont charge to higher V they will last u longer but you will have lower capacity available
OK, thanks REVOJohn, got it. I couldn't get any text on my tablet but pulled it up on the PC.

For the rest of you. Same nominal voltage. So you have the same bottom end voltage but higher top end and staying away from the limits on the top and bottom end will give longer cycle life.
Apr 12, 2015, 10:23 AM
Registered User
hbollier's Avatar
Just a quick note: my 435 blend 6S 4600 batteries arrived. I charged them up and did a power test with the batteries in series as a 12S pack. Under a 72amp load they held up to 3.85-3.87 V per cell. 1.8V with a motor running 208kV unloaded is over 300 rpm increase over my current batteries. Castle Creations gave the OK to run the HV80 ESC at this voltage BTW. I am looking forward to putting these in the air. They look great so far, I just hope to get good cycle life out of them. We shall see. My current packs range from 30-80 cycles each. The cheap packs are going strong at 80 and one of my "better" packs is losing power at 50 cycles.
May 30, 2015, 11:34 AM
Now I'm a "Low Flyer"
high flyer Rich's Avatar
I have a question.

I'm newer to electrics and my only experience is with Pulse 6s 3300 65c on a EF 60" laser. I've been very happy with them, but have nothing to compare with. I have approx. 150 cycles through them with no noticeable change.

Now I'm going to be building a 3dhs 75" Extra 12s with a DM-4330/216 and a Jeti Mezon lite 90 12s ESC w/telemetry.

I was thinking about the Revo 435's 3700mah 40c (Platinum).

For longevity, I would most likely be doing a standard balanced charge. If I want to try Revo's, is the 435 40c the best battery for my use or is there a better option in their product line up, or somewhere else for my 12s needs?

I don't have a club nearby to ask questions, so any comments or suggestions would be appreciated!

Thanks, Rich
Last edited by high flyer Rich; May 30, 2015 at 01:23 PM.
Jun 05, 2015, 06:34 AM
Registered User
Since no one else has answered I'll jump in. From what you have said I don't think the 4.35V Revos are what you want if you are looking for longevity. The standard 4.20 blend in 60c will last longer.

I have a 74" edge running an MF4330 216 on 12s with Revo 3300 4.20V 40c packs. 60c won't fit, but they will fit the 75" Extra. My setup is more powerful than I need and my flight time is 8 minutes.

4.35 packs would increase flight time for the same weight and also increase power. Or you could save some weight for the same pack capacity if you wanted a light setup.

I will be trying some 4.35 packs soon in an application where I am looking for both more power and longer flight times.
Jun 06, 2015, 11:33 PM
Now I'm a "Low Flyer"
high flyer Rich's Avatar
Quote:
Originally Posted by Jason50
Since no one else has answered I'll jump in. From what you have said I don't think the 4.35V Revos are what you want if you are looking for longevity. The standard 4.20 blend in 60c will last longer.

I have a 74" edge running an MF4330 216 on 12s with Revo 3300 4.20V 40c packs. 60c won't fit, but they will fit the 75" Extra. My setup is more powerful than I need and my flight time is 8 minutes.

4.35 packs would increase flight time for the same weight and also increase power. Or you could save some weight for the same pack capacity if you wanted a light setup.

I will be trying some 4.35 packs soon in an application where I am looking for both more power and longer flight times.
I appreciate the feedback. Even though I want the right combination of power and weight, I am concerned about longevity of the batteries. I don't want it to fly too heavy, but I sure enjoy acceleration out of a hover!

I think for now, I'm going to try my Pulse 6s 3300 65c's that I already use on the 60" Laser and see how it goes from there. This is a learning experience for me, but it's nice to learn from other peoples experiences.
Jun 16, 2015, 01:14 PM
Registered User
So, my buddy Vic and I maidened our new Revo 435 30C lipo's, and we were thoroughly impressed. He charged his 10S 5100 combo (4S+6S) to 4.28V to fly his JTM 90mm Viper, while I charged my 12S 10,200 combo (6S+6S, 5100X2, so four lipos in series and parallel) to 4.35V to fly my JTM 120mm Viper.

See videos below of the two flights. The smaller Viper was fast and powerful, noticeably more so than Vic's previous 9S setup, while the bigger Viper flew a good hard 7 minutes (BVM EVF 12S fan) with still 3.8-3.82V remaining at landing, meaning it could've easily gone 8 minutes.

Kevin

JTM 90mm Viper (10S 5100 Revo 435 30C)
JTM 90MM Viper with 10S Revo 435 (3 min 22 sec)



JTM 120mm Viper (12S 10,200 Revo 435 30C)
JTM 1 7M Viper 7 minute flight (7 min 15 sec)
Jun 23, 2015, 08:14 PM
Registered User
RevoJohn,

You mention that we can have more cycles charging 435 with 4.2V, what will last longer a 420 or a 435 being charged as 420 (4.20V)? i see that in the Revo site we have indication that 435 will last minimum 150 cycles, how many cycles will a 420 last?

Regards
Ronaldo