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Old May 19, 2014, 02:28 AM
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Revolectrix Silver Label 427HV 70C batteries

I thought I would start a thread on the Revolectrix HV series lipos. These packs can be charged to 4.27V per cell instead of the usual 4.20 and are light weight for the capacity.

http://www.store.revolectrix.com/Pro...70C-427HV-LiPO

I've brought a pair of 6S 3600mAh packs to try in my new Goblin 570 helicopter. I ended up creating a stick pack to use in my helicopter using some of the clear SAB battery tray heatshrink



Initial impressions:

I ordered my packs from the Singapore store and they arrived 4 days later which is super fast considering the packs are assembled to order. The packs were within 0.5mm of the measurements given on the website which was important to me as I knew it was going to be a close fit in my helicopter. The packs look well made, they are nice and solid, they have a 3 stage temperature sensitive label that indicates how warm the packs are getting in use, plus its a nice bonus to have my name printed on the labels.

In flight these packs are performing beyond my expectations I have tried them charging to both 4.25V and 4.20V per cell and they hold voltage under load better than my other packs I have used. The packs come down cool after a flight and I haven't been able to get them warm enough in use to change lowest value temperature label on the packs (I know the labels work because when I applied the heatshrink I got lowest value "45 deg C" to turn green for a moment). The packs have plenty of power and my helicopter feels great with lots of punch.

I gave my packs 3 break in cycles on my charger and 2 easy flights in the model - not sure if its needed but I like to do this to all my packs and I haven't included these cycles in my total. I will update this post every 25 cycles of the packs to see how many cycles they last and how the IR values track over time along with my impressions on how they feel power wise and castle creations data logs of flights.

I measured the IR of the packs using a Hyperion charger after the packs had been at 22 deg C for over an hour.

New Packs
Pack 1 - 6S 3600mAh Cell IR 2.2, 1.8, 2.1, 1.8 1.6, 2.1
Pack 2 - 6S 3600mAh Cell IR 2.0, 1.7, 2.0, 1.5 1.7, 2.0
Peak Power 3.70 kW

After 25 Flights (Post 7 - 25 Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.9, 1.6, 1.9, 1.6 1.8, 1.8
Pack 2 - 6S 3600mAh Cell IR 1.9, 1.7, 1.8, 1.5 1.9, 1.7
Peak Power 3.84 kW

After 50 Flights (Post 19 - 50 Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.7, 1.5, 1.7, 1.6, 1.7, 1.8
Pack 2 - 6S 3600mAh Cell IR 1.9, 1.6, 1.5, 1.5, 1.8, 1.9
Peak Power 3.60 kW

After 75 Flights(Post 36 - 75 Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.8, 1.5, 1.6, 1.4, 1.5, 1.7
Pack 2 - 6S 3600mAh Cell IR 1.8, 1.5, 1.6, 1.5, 1.8, 1.7
Peak Power 3.50 kW

After 100 Flights (Post 55 - 100 Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.8, 1.6, 1.8, 1.5, 1.7, 1.7
Pack 2 - 6S 3600mAh Cell IR 1.9, 1.5, 1.6, 1.6, 1.8, 1.7
Peak Power 3.49kW

After 125 Flights (Post 62 - 125Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.8, 1.6, 1.7, 1.5, 1.8, 1.7
Pack 2 - 6S 3600mAh Cell IR 1.8, 1.6, 1.7, 1.6, 1.7, 1.8
Peak Power 3.52kW

After 150 Flights (Post 107 - 150Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.9, 1.6, 1.6, 1.7, 1.8, 1.6
Pack 2 - 6S 3600mAh Cell IR 1.8, 1.7, 1.6, 1.6, 1.8, 1.7
Peak Power 3.60kW

After 175 Flights (Post 117 - 175Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.8, 1.6, 1.5, 1.6, 1.7, 1.6
Pack 2 - 6S 3600mAh Cell IR 1.7, 1.7, 1.6, 1.5, 1.8, 1.6
Peak Power 3.60kW

After 200 Flights (Post 130 - 200Cycle Update)
Pack 1 - 6S 3600mAh Cell IR 1.9, 1.6, 1.7, 1.7, 1.7, 1.7
Pack 2 - 6S 3600mAh Cell IR 1.8, 1.7, 1.7, 1.6, 1.8, 1.7
Peak Power 3.33kW

After 225 Flights (Post 144 - 225Cycle Update)
Pack 2 - 6S 3600mAh Cell IR 1.7, 1.7, 1.6, 1.6, 1.7, 1.8
Peak Power 2.88kW (Single 6s Pack)

After 250 Flights (Post 153 - 250Cycle Update)
Pack 2 - 6S 3600mAh Cell IR 1.9, 1.6, 1.6, 1.5, 1.7, 1.6
Peak Power 2.43kW (Single 6s Pack)

After 275 Flights (Post 161 - 275Cycle Update)
Pack 2 - 6S 3600mAh Cell IR 2.0, 1.6, 1.7, 1.6, 1.7, 1.8
Peak Power 3.08kW (Single 6s Pack)

After 300 Flights (Post 191 - 300Cycle Update)
Pack 2 - 6S 3600mAh Cell IR 2.0, 1.8, 1.5, 1.7, 1.8, 1.8
Peak Power 3.083kW (Single 6s Pack)
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Last edited by Jactor; May 18, 2015 at 06:25 PM. Reason: 300 cycle update and peak power added to cycle updates
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Old May 19, 2014, 06:33 AM
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What charger are you using? Hyperion? Model?
At what C rate are you charging?

Glen
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Old May 19, 2014, 07:40 AM
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If I follow your Castle data correctly, you are peaking at 3000Watts and maxing at around 2000 Watts during normal flight.

At 22.2V nominal that is about 37C and 25C respectively. I cannot read the current trace.

Not sure if you are using a 2x 6S in parallel or 2x 6=12S pack ( I am not a heli guy )

As they are holding a strong voltage at those C ratings, if they are 6S single packs they are doing well. If they are a 2x 6S in parallel or a 12S pack they are hardly stressed and not particularly remarkable.

John
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Old May 19, 2014, 09:50 AM
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Those IR's are super low for a 3600 cell!
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Old May 19, 2014, 12:41 PM
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~330 second flight. Presuming 80% DOD, this equates to ~9C average rate of discharge. I agree with John that this is not taxing at all and pretty much any decent quality lipoly can easily cope with this.

Not that the packs are bad in any way, it's just that this particular application did not stress them in a way that would give an indication that they're superior to any other lipoly packs that are commonly available.

Will be interesting to see how they perform after a year and 100+ cycles.

Mark
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Old May 19, 2014, 02:28 PM
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ggcrandall1

I'm using a hyperion 613 Duo 3 charger and have upped the TVC setting to charge these packs. I'm currently charging a 2C as I want areal world test of these packs and TVC is set at 4.25V so not quite 100% charge for these packs.

jj604 & mrforsyth

Hi guys first off I l really appreciate your posts in this forum they were the main reason I decided to try something new. The packs are in a 12S application and I agree not stressed in any way at the moment . I have flown a set of Zippy Compact 35C packs 12S 3700 mAH with same motor and esc combination and they come down a lot warmer had had voltage dips a lot lower but my comparison is subjective at the moment. The log is pretty indicative of the heli and its power demands. I do have a larger heli that is under construction with a much larger power system (motor is rated 5.1kW continuous and 11kW peak) I will be running the packs in this to see how they take a real beating and will include logs from this.
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Old May 23, 2014, 07:32 PM
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25 Cycles Update

Packs are still going strong. Just flew flight 25 this morning, in the helicopter the packs are still feeling like new with no signs of decrease in power - in fact the castle logs show a new peak power output of 3844 watts up from 3700 watts (these are only brief spikes in the flight). Physically they are still feeling solid and showing no signs of swelling or deformation and they come down barely warm after each flight.

Time will tell how they track with more cycles - but so far I'm really happy with these packs

After 25 Flights
Pack 1 - 6S 3600mAh Cell IR 1.9, 1.6, 1.9, 1.6 1.8, 1.8
Pack 2 - 6S 3600mAh Cell IR 1.9, 1.7, 1.8, 1.5 1.9, 1.7
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Old May 25, 2014, 04:33 PM
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Jactor.
I've been running a couple of 5500mah packs in boats for a while now. Only a dozen or so runs on them as single 4s packs or in series as an 8s pack.
Great packs. Hold the voltage up well during the discharge. No fancy test gear. I can just hear the motor & prop singing at a slightly higher pitch & see/feel the boat riding a bit faster than with other packs. Purely subjective, I know.
Under our racing regulations, Max nominal voltage is 14.8. So I can only charge up to 4.2V/cell to be legal. Although for sport running I do fully charge them.
I can't notice any real speed difference from 4.2V/cell to being fully charged to 4.27V/cell.
The only thing is that they take on less capacity at the lower voltage.
I'm impressed with them.
They are still like bricks & all the IR readings are still between 1.6-1.9 m/ohm.
Cheers.
Paul.
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Old May 26, 2014, 03:27 AM
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Hi Paul good to hear you are enjoying your packs as well. I think it makes sense your prop is spinning a faster with the higher pack voltage. how are you finding the temperature of your packs after a race/sports session?

I'm certainly noticing the difference in how my helicopter performs, I use a governor setup to maintain a set rotor headspeed, as you increase load the esc increases power output to maintain the set speed. I'm getting less variation / drop in headspeed now. I think the packs voltage holding ability is making the governors job easier. I got a friend to fly my packs in his 700E helicopter yesterday and the result was the same the governor was holding headspeed better with my packs than it does with his usual 40C 5000mAh batteries.

Cheers
Jason
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Old May 26, 2014, 05:01 PM
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I have no idea why some want to say these packs are not doing a good job and they are not impressed with them because the users is not maxing these packs out

the good thing with better packs than ones than "any decent quality lipoly can easily cope with this" is they maintain volts ...
they keep the rpms up while under a load..
that means more usable power during the run with less voltage sag..

for me in FE racing this is good to have packs that can keep my amp hungry boats running fast longer, rather than just any pack like hayin and turnigy that cannot keep my rpms up during a race..

even with my Spec boats that pull 65-80amps cont. during a race run better and faster with better packs... and that's only 13-16C on the packs
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Old May 26, 2014, 05:29 PM
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Quote:
Originally Posted by brushless55 View Post
the good thing with better packs than ones than "any decent quality lipoly can easily cope with this" is they maintain volts ...
they keep the rpms up while under a load..
that means more usable power during the run with less voltage sag..
...which is obviously true if they indeed have lower internal resistance than their competitors.

As I predominantly use 2200mAh size packs, I'd like to try these 'HV' packs but not before I see measured data from someone that I trust. While the larger capacity cells may have good measured and observed performance, the same does not necessarily hold true for smaller capacities, as my personal experience has taught me.
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Old May 26, 2014, 08:08 PM
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I got a friend to fly my pair 6S 3600mAh HV packs in his 700E helicopter which has a reasonable power system with a motor capable of 5.1kW continuous hoping to see what they do under a higher average load. Attached is an image of the Castle datalog from his flight and a txt file which can be loaded in the castle graph viewer by selecting the 'all files' option. I cut out the data from before and after the flight so only the flight time is showing.



From a subjective standpoint he commented that the packs felt good for the whole flight - normally he notices a dip in performance after a minute or so with his usual 40C 5000mAh packs and the governor was not 'bogging' (allowing rotor head speed to drop) as much as usual when heavily loaded. Objectively when we looked at this log compared to his normal packs he had a peak power output spike of 7700W at 185amps the most he has managed with his normal packs is 6800kW peak spike - a 900W improvement with smaller capacity Revo HV packs

I was pretty happy with how they held up. I will report again once I get to 50 flights on the packs as I am really interested in how they hold up over time.
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Old May 26, 2014, 11:30 PM
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Quote:
Originally Posted by mrforsyth View Post
...which is obviously true if they indeed have lower internal resistance than their competitors.

As I predominantly use 2200mAh size packs, I'd like to try these 'HV' packs but not before I see measured data from someone that I trust. While the larger capacity cells may have good measured and observed performance, the same does not necessarily hold true for smaller capacities, as my personal experience has taught me.
I'm in the same boat as you my friend
I like the Giant power / Dinogy packs in the 4s 5000mah but in the 2200mah 3s packs they suck
also the 130x packs are not very good either
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Old May 26, 2014, 11:36 PM
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Quote:
Originally Posted by Jactor View Post
I got a friend to fly my pair 6S 3600mAh HV packs in his 700E helicopter which has a reasonable power system with a motor capable of 5.1kW continuous hoping to see what they do under a higher average load. Attached is an image of the Castle datalog from his flight and a txt file which can be loaded in the castle graph viewer by selecting the 'all files' option. I cut out the data from before and after the flight so only the flight time is showing.



From a subjective standpoint he commented that the packs felt good for the whole flight - normally he notices a dip in performance after a minute or so with his usual 40C 5000mAh packs and the governor was not 'bogging' (allowing rotor head speed to drop) as much as usual when heavily loaded. Objectively when we looked at this log compared to his normal packs he had a peak power output spike of 7700W at 185amps the most he has managed with his normal packs is 6800kW peak spike - a 900W improvement with smaller capacity Revo HV packs

I was pretty happy with how they held up. I will report again once I get to 50 flights on the packs as I am really interested in how they hold up over time.
Awesome news
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Old May 27, 2014, 04:05 AM
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Jason.
Quote:
Hi Paul good to hear you are enjoying your packs as well. I think it makes sense your prop is spinning a faster with the higher pack voltage. how are you finding the temperature of your packs after a race/sports session?
Temps have been fine.
As you know the lable has the heat sensitive colour markings on them. Most runs stay in the green(45C) Once or twice I've seen a faint glimmer of yellow (55C). Thankfully I've never seen the red (65C).
I don't know how accurate they are & I don't use a temp gun. I can tell by feel if I've over taxed a pack.

Here's two 4s packs as an 8s1p 5500mah fully charged in my 1/8 scale hydro.
73mph (Gps). Motor, 240A ESC, & batteries all just warm & 34% left in the pack at the end of the run. None of my Entropy, Dinogy, Haiyin, China hobby line packs would give it that speed.
Enjoy.

The U-95 from Wet Track Racing. (1 min 39 sec)
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