Hextronic Lipo's

[charlatan]

Is there any chance of you getting some 5s packs, or even some 2s packs so we can link them in series with the 3s packs to make a 5s pack of some of the 2200mah lipo's you sell?

[CSO#1 @UHobbies]

Hello.
Because we order direct from the factory in quantities of 1000pc per model, we must be very very careful about the batteries we choose to stock.
2S packs in 2200mah capacity dont appear to sell very well.
We havnt stocked 5S, though I will look into it, as it may be a good enough seller to order.

Rgds

[KAMIKAZIMAN]

Hi. I have 3 of your 20c 1000mah batteries. They are great batteries and came with all cell within .01v of each other.

I am however missing an order (#2002657) for 2 of these batteries and would like to find out where that order is. I have received 3 orders from you so far including ones shipped over a week later all to the same address. Your site shows of ship date of 11-6 for that order, but no tracking #.

What would be the best way to resolve this?

Thank you,
Ken Clayton

[CSO#1 @UHobbies]

Hi. I have 3 of your 20c 1000mah batteries. They are great batteries and came with all cell within .01v of each other.

I am however missing an order (#2002657) for 2 of these batteries and would like to find out where that order is. I have received 3 orders from you so far including ones shipped over a week later all to the same address. Your site shows of ship date of 11-6 for that order, but no tracking #.

What would be the best way to resolve this?

Thank you,
Ken Clayton
Please send an email to support@unitedhobbies.com
Because it's the Christmas rush, everything is a little behind, the postal system and our dispatches.
Please do not fear, we will replace any lost parcels.

Thanks
Karen.

[MartinL]

Dont mean to be fussy on your 5S 4100....why 12C??? in this day and age it is 6+ mth old technology..at least 15-25Cs

[CSO#1 @UHobbies]

Haha, I knew someone would say that.
We're listing 20C big packs in January.

[OneDayFly]

Haha, I knew someone would say that.
We're listing 20C big packs in January.

Great; I will defenitely buy those!
I have very good experiences with the 3s 2250 mAh packs (20C). :)

[mmormota]

Great; I will defenitely buy those!
I have very good experiences with the 3s 2250 mAh packs (20C). :)

Do you have longevity experience with them?

I just built a 9s2p pack using 6 of them for my eRaptor. First flights went very well. I am curious how much cycles will they provide. Average load is rather low, 5...6C only with 12C short peaks. The battery is just slightly warmer then my hand at landing.

[Greg_Granville]

Dont mean to be fussy on your 5S 4100....why 12C??? in this day and age it is 6+ mth old technology..at least 15-25Cs

Actually, I believe these match the newest/best "Gold Rate" packs from DualSky (http://2dogrc.com/ecommerce/os/catalog/dualsky-4000-185v-lipoly-battey-p-2007.html) .

If you want 20c constant discharge "rated" cells, you have to parallel connect a bunch of 2200 cells (https://www.unitedhobbies.com/UNITEDHOBBIES/store/comersus_viewItem.asp?idProduct=4133) /packs. That ends up being much heavier and larger. If you really want the 20c rating, you currently have to make that tradeoff. Otherwise, pay the BIG, BIG, BIG BUCK$ for TP Extreme, FlightPower, etc...

[kevin]

2S packs in 2200mah capacity dont appear to sell very well.

if you get 2 cell packs....i will take 4 for now and more later...depending on how well they would hold up in and edf application.

[muda]

You can buy 2 packs 3s, and easy make 3 packs of 2s :D, only some wires ,and balanceing taps required. If you only can swich solder on, of course .:D

[kevin]

makes more sense to split 2 4s packs into 4 2s...no? anyway....would rather avoid reworking the packs.

[muda]

makes more sense to split 2 4s packs into 4 2s...no?
sure . I did't noticed 4s packs, as I wasnt looking for them :D

[MartinL]

I wish UH could get the 2S2200 packs. This way we can mix and match for 4 or 5S in series without having to break the packs. Its bad news soldering alluminum especially when u do not have a clean dedicated alluminum head. I used to buy loose cells when Lipo 1st came out and make them up, and they never lasted because of bad soldering, causing arcing and balloning the pack. I make all my own Nicad/NiMh b4 lipos and I thought it was easy:( So UH how about 2S ????????

[chase4556]

how well do these hextronic packs hold voltage under load?


do they perform as advertised? I figure this is a good place to ask, seeing as obviously all of yall have tried them.

3s packs ranging from 1500mah to 2000mah is what I'm looking at..and from 10-15c. Do they do well under load at holding a good voltage? AKA 10+volts?

[mjdoz]

There does not seem to be any graphs or hard info that I can find. This post http://www.rcgroups.com/forums/showpost.php?p=6734071&postcount=16 is from my eagletree and shows the full discharge of a brand new 2200 3S pack at around 8C.

Unfortunatly all my other packs are 2 or more years old so I cannot state if the results are good in todays terms but they certainly out perform my other packs

Michael

[MartinL]

There is a report on these packs at Quiet Flyer Nov 2006. Pretty positive..

[Greg_Granville]

I've run the 2200's on a CBA, but can't really load them enough to give them a serious test. Limitations of the CBA...
I can say that when run in the same aircraft as another (admittedly low-end) LiPoly of the same capacity, a huge difference in performance was evident.
I've been able to pull multiple 50 amp bursts from these in my FunJet. None of my other bargain packs could ever come close to that kind of current.

[mjdoz]

I've been able to pull multiple 50 amp bursts from these in my FunJet. None of my other bargain packs could ever come close to that kind of current.

Greg,

Any idea what the voltage dropped to when you pulled 50 AMPS? I am a bit limited in what I can load the motor with until I get some new Props and have only been able to get to 26 Amps with Voltage holding at around 10.5 - 11.0.

See attached graph from the Eagle Tree

Michael

[charlatan]

Got some of the 5s 4100's. Can you tell me how their balance plug is wired so I can get a suitable lead for balancing?

[mjdoz]

Can you provide a picture?

Michael

[Greg_Granville]

Greg,

Any idea what the voltage dropped to when you pulled 50 AMPS? I am a bit limited in what I can load the motor with until I get some new Props and have only been able to get to 26 Amps with Voltage holding at around 10.5 - 11.0.

See attached graph from the Eagle Tree

Michael

Lost track of this thread I guess. :o
Anyway, yes. The voltage at 50 amps held around 9.9 to 10.0 volts during those short bursts. However, I couldn't get those numbers unless the pack was warmed up first.

An interesting update. A couple of weeks ago I was doing some static tests on a new Hextronik inrunner (HXT2835-3900) driving a 12x6 APC prop through a Cobri gearbox. I was at my friends house and we used his batteries and Phoenix 25 speed control. His LiPoly - a new 2070mah Thunder Power Extreme was charged right before the test.
Full throttle static test pulled about 230-240 watts. Voltage sagged to about 10 volts. I was hoping for more watts than that.
I took the motor home, and without changing the prop or gearing, I connected it to my HobbyWing 40a controller and a Hextronik 2200 3s pack. I was surprised to see it pulling 290 watts with the volts in the high 10's!
My Hobbywing ESC was set for "low" timing. My friend wasn't certain, but he thinks his Phoenix was set for Auto timing.
We both agreed that we need to retest these two packs again under more controlled contitions - same temperature, same ESC, etc. But the difference in the battery voltage sag is not so easily explained away. He uses Power Poles ( I use Deans) so we don't think the problem was a loss at the battery connector.

[CSO#1 @UHobbies]

2S packs on the way.
We have put in orders for 1700, 2200,3250mah 2S.

Rgds
Admin

[A Monell]

I hadn't realized UH was here.
maybe someone can respond to post #43 http://www.rcgroups.com/forums/showthread.php?t=615407&page=3
thanks :rolleyes:

[Tadango]

20C cells are great but only if they are the same weigth or less! 12C is enough for my planes and i a lighter pack is better. Thunderpowers / Hyperions are still 10% lighter so 6s4100 20C sould not weigh more then 660g, if so they are worthless to me.

[wolw]

I got 3.35V/cell om my 2200mAh 4S1P under 19C load, obly short bursts though.

//Peter :)

[Borlax]

I have used HXT D9 2200 mA 5s packs as 4 packs that is 10s2p on a CAP 232 25%. They are very reliable and powerfull, they only gets luke warm on hard use, i am very satisfied by these cells. It would be nice if we could buy the cells individually, so i could configure my own packs. I´m in the process of making a electric power setup for the Hangar 9 Ultimate 46%, using 2x A6070/6 6,6Kw motors in series, with 2x JETI-SPIN200A and 14s2p for each motor 56 cells i all. It is more easy to make the packs myself, than buying different packs and breaking them apart.

[roosevelt]

2s packs would be nice. I still don't see them listed. 2200's?

[Dadzilla-5]

So if I wanted to charge a hextronic pack with my cellpro balance 4 charger, what adapter do I need? I have polyquest and TP and of course cellpro.
zilla

[roosevelt]

Dadzilla, the 3s 2200 taps are a direct fit on my csrc ultra balancer. Not sure what tap it is configured for though. The taps are in order voltage wise red to black 4.2, 8.4, 12.6.

I recently ran an APC 9x6 sf prop on a HXT 35-36B 1300kv Brushless Outrunner (Eq:2814) with the 3s2200 20/30c lipo. The latest one w' the blue shrinkwrap.

It pulled roughly 44 amps at 10.5v with 460 watts of power. I ran 2 bench tests for approximately 5 seconds each with same results. I then ran the setup in my Cox ep380 and after coming in the resting voltage was 10.5 and the pack was slightly puffed. I only made one run at wot for 5 seconds. The rest of the time was spent at 1/2 to just under 3/4 throttle. 10-25a respectively. The pack was 118 degrees F.

The puffiness has not went down completely. This pack has about 6 to 8 uses on it and two or three times the voltage dropped to around 9v resting. Prior to this I only ran it at 10c or less with 15-20 second 15c bursts.

I have used 3 different esc's with this battery and all are set for 3v per cell cutoff. If it reaches lvc the pack does not rebound while resting. Twice my common sense ultra balancer has signaled that one cell was under the 3v mark. I slow charged it at 300mah as per their instructions both times. My voltmeter showed over 9v every time.

With all my other packs maintaining a resting voltage of 11.1 is not a problem. I time my flights and the volts usually rebound after resting. But w' this pack the voltage doesn't seem to drop until it's lvc and they do not rebound upon resting.

Was it the lvc that puffed it or the short 20c bursts?

[wedge98]

So if I wanted to charge a hextronic pack with my cellpro balance 4 charger, what adapter do I need? I have polyquest and TP and of course cellpro.
zilla

You need to buy their $10 adapter listed below.

NOTE: It will not handle 4s packs. I do not know how to charge those except to take apart the LiPo and rewire them with cellpro cables.

http://www.fmadirect.com/detail.htm?item=2196&section=45

[helitaiwan963]

for those of you using the 2100 mah packs? how are they olding up? I wnt to try seom of the new D9 HXT lipos


Later
Eric

[Clark06000]

Hi
There are lots of uncovered points on lipos misuse. To my opinion, using these 20C lipos at this limit is not recommended: better use them at around 15C max if you want to save their lifetime (that nobody knows about...)! There is a reasonnable limit dictated by your purse and investment.
This 20C spec looks more commercial and means nothing because:
- at 20C, what is the real voltage of each cell?
- what is the lower limit voltage allowed?
- what are the temperature limits and chemicals safety?
- are there unrecoverable effects if permanently run at such rates?
- how is a cell classified, what are quality and price relations?
No maker's data on these factors... Some factories in China and one in Korea?
Look at the graphs given by Kokam for instance!
They give discharge data on different currents and you will see the poor performances under severe usage at 20C upper limit. So, up to you to decide what to do!
For me, still unclear points and I use lipos at 12 to 15C max to get a good lifespan.
All the best.