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LiIon, LiPo, NiCd & NiMh General General Battery Support


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Old 09-12-2015, 07:44 PM   #1 (permalink)
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Default Roaring Top Lipo

Hello

I wanted to take a moment and get my first impressions out for the brand.

First off I want to thank Junlin and Roaring Top LLC for offering a program for pilots to test this brand. With that said...

http://www.roaringtopusa.com

Roaring Top Lipo-New
2 - 6S 3300mah 60C
18.78OZ per pack without EC5
Align Trex 600PRO DFC
Castle Pheonix ICEHV 120amp ESC
Hard mild 3D flight
4:30 minute flight
2050rpm
No cycling or break-in done on packs

I charger 208B
14A charge in parallel
Preflight IR's 25 (checked upon delivery)
Post flight IR's 17 after rest
Temp 75F
Once my Wayne Giles ESR meter arrives I will get a better idea of IR values

My first impressions of the brand is

Very well built
Packaging is spot on
Shipping fast
Price is affordable

My first impressions on flight performance

Awesome power with no sag during entire flight
Packs came down at 88F degrees
Cell balance was dead on
IR is promising
Voltage at end of the flight @3.78

The first flight was testing the power delivery from these packs. The flight had a mix of full cp punch, tictocs, big hard loops and full collective speed passes.

The packs delivered great power the entire flight with no noticeable sag. I have flown many different brands of batteries and my first impressions of this brand is very solid. I will also do more updates with data logging as I get more flights on these packs. If I can pull at least 200 cycles from the packs I will be happy. Since I have several sets of packs for each of my helis, that cycle count would be approx a year or two of flying. I typically fly packs for a couple years then re-up to fresh packs and sell these to local flyers.

I will be looking at the 6S 5000 60C when they are in stock to fly in the 700 size heli

I am always looking for a good brand and Roaring Top has won me over with my first impressions.Click image for larger version

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Be safe, fly low, have fun and help promote our great hobby!! Thanks for reading my thoughts on this brandClick image for larger version

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Old 09-12-2015, 08:46 PM   #2 (permalink)
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link?
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Old 09-14-2015, 05:53 PM   #3 (permalink)
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Default Additional on-going testing

I also am in the process of testing a couple Roaring Top Lipo's.

While I'm using them in EDF jets (hard duty) my experience is the same as is being reported above. I 've got 12 cycles on 4S 2200mah 35C pack and 6 cycles on a 6S 4500mah 45C battery. Demand is roughly 50 amps for the 4S and 85 amps for the 6S.

Why the jury is still out on how these two packs hold up over time., they are off to a good start. Their testing program is pretty straight forward. If you are selected to be a tester then just pick out 2 lipo's from their in-stock inventory and use them as you wish. The only requirement is that you share your findings.

Other than that, so far, they have not interfered with how I use of their product. Like most of us I'm always looking for the perfect Lipo; good power, cool running, long lasting, no puffing, consistent quality and reasonably priced.



One sign of promise is that apparently they manufacture (their own cells / packs from the raw material all the way through cell testing ,matching and pack assembly. First thing I did was charger them, let them reach a stable temp of 77F and then tested their IR's with Wayne Gyles ESR meter. The 6S cells were well matched at 2.5 to 2.6 mOhm as was the 4S cells at 4.2 to 4.3 mOhm. As a result their calculated FOM's were .9 and 1.2 respectfully. Not too bad.

I have no idea if Roaring Top will ultimately come close to these characteristics but whether they do or don't I plan on just sharing what I experience.

Larry
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Old 09-16-2015, 09:18 PM   #4 (permalink)
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Thanks Larry that is great to hear. I will be heading down to RC heli nation's fun fly in the am and will really put these packs through a 4 day ringer! I certainly like what I have experienced so far. Longevity is what I am looking at now. Thanks for adding your experience

Seth
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Old 09-19-2015, 12:38 PM   #5 (permalink)
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Default Update

I currently have 18 cycles on the RT 4S 2200mah 34C flying it in my 70mm Meteor EDF.

So far so good. The pack is putting out good power for the entire flight (at 50 amps max) and comes down only slightly warm. No signs of puffing.

It would be nice if it continues to perform as well after 50 ,75 & 100 cycles. We'll see.

Larry
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Old 09-19-2015, 12:50 PM   #6 (permalink)
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Will try next season.. excellent price and since I only need one pack per heli (field charge) saves even more! And makes it easy to get a bunch of cycles to test a new brand.
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Old 09-20-2015, 06:47 PM   #7 (permalink)
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As posted on the other forum, I've got my 2 samples to use with my stretched Protos with 470 blades. I've had very good experience with nanotech 6S 25C 3000 still going strong after 250 flights. Looking forward to see how these ones stack up.

http://www.rcgroups.com/forums/showt...5#post32739513

To summarize my 1st impression:

-- these 35C packs are in line with nanotech 25C packs in terms of size and weight.
-- balance plug is too short for my liking. Tricky to use with paraboard.
-- IRs are still high before break-in so not fair to compare with my 250 flight old nanotech 25C for now.
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Last edited by DoubleCH; 09-20-2015 at 11:13 PM..
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Old 09-20-2015, 10:14 PM   #8 (permalink)
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I have 2 easy charge/discharge cycles on my charger now. I charge them at 1C to 4.19V per cell and discharge them at 10A (~3C) to 3.80V per cell down to 5% (0.5A). The cell voltages are quite well matched with the roaring top lipos compare to the nanotech (perhaps the 250 flights of age show), but interestingly the nanotech still finishes CV phase faster than the roaring top lipos. The nanotech has lower increase in internal temperature compare to the roaring top but again I hope the roaring top will improve after broken-in. The charts orders are RT2700 charge, RT3300 charge, NT3000 charge, RT2700 discharge, RT3300 discharge, and NT3000 discharge.
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Last edited by DoubleCH; 09-20-2015 at 11:35 PM..
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Old 09-24-2015, 10:38 AM   #9 (permalink)
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Received my Roaring Top 6s 3300 60c today. Thanks Junlin for letting me review these batteries.

My first impressions are:
- Shipping was fast and batts were well packaged
- Size and weight seems to agree with manufacturers specs
- 10ga power leads
- Silicon balance wire is a little short. It will be awkward if you charge
these on para boards.
- I am disappointed on the 2C only charging limit as stated on the warning
label. I always charge 2C after break in so I will find out how many cycles
these batts can do at 2C charge rates.

More reviews to come later...
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Old 09-27-2015, 06:46 PM   #10 (permalink)
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So after cycling my RT 3300 60C 5 times, IR went down from 3mohms (before break in) to 2.6-2.8 mohms. Pulled almost 71A and voltage sag was about 3.5V per cell.

Here is the vid link:
Roaring Top 3300 60C 6s 5th Cycle (4 min 31 sec)
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Old 10-14-2015, 11:30 AM   #11 (permalink)
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After a month+ hiatus due to moving, I was finally able to fly again. My brand new Roaring Top 35C 2700 and 3300 have only been thru' some charge/discharge cycle tests until now. Those tests suggest the packs didn't perform any better than my 250-flight old nanotech 25C 3000 in terms of IR and temperature-rise under load. Flight tests seem to suggest similar. Hope they'll improve after more use but I remember my nanotech 25C 3000 were good from day 1.

Here're the flight videos with Roaring Top 35C 2700, 3300, and Nanotech 25C 3000 respectively.

My Stretched Protos Comparing New Lipos [Roaring Top 35C 2700] (4 min 16 sec)

My Stretched Protos Comparing New Lipos [Roaring Top 35C 3300] (4 min 30 sec)

My Stretched Protos Comparing New Lipos [Nanotech 25C 3000] (3 min 2 sec)


I also did some comparison with my new Zippy Compact 35C 2450 for review with my Bolt 65C 2400 which of course is no competition. I intend to compare the Zippy Compact with my nanotech 35C 2200 which will have to wait until my 450DFC is up and running.

Here're the flight videos with the Bolt 2400 and ZIppy Compact 2450 as more reference to the Roaring Top 35C and Nanotech 25C.

My Stretched Protos Comparing New Lipos [Bolt 65C 2400] (3 min 21 sec)

My Stretched Protos Comparing New Lipos [Zippy Compact 35C 2450] (4 min 15 sec)
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Old 10-16-2015, 09:06 PM   #12 (permalink)
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I have a set of 6S Roaring Top 4500 mah 35C batteries that I am testing out in an Agile 5.5. So far they are looking good. After about six cycles IR seems to be settling in below two on all cells of each battery.

Will post some Castle logs and graphs from the FMA CCS software when I get a chance.
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Old 10-18-2015, 08:59 PM   #13 (permalink)
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Here are the some IR logs from the FMA Charger Control Software for my Roaring Top Lipos. They are a pair of 6S 4500 mah 35C batteries that I am flying in an Agile 5.5.

Batteries have been performing well and have no complaints so far. The main and balance leads could be a little short for some helis, however for the Agile 5.5 it is perfect and since I have parallel charging squids the balance lead length is no issue either.



Very first charge on battery #1. Initial IR values were higher than #2 battery.


Battery #1 IR values after fourth charge. Settling in nicely at under a 2 IR on all cells


Battery #2 IR values on very first charge.


IR values have settled in nicely well bellow 2 on all cells after 6th charge.
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Old 10-31-2015, 01:03 AM   #14 (permalink)
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After 30 flights on each of my Roaring Top 35C packs (2700 and 3300), I was hoping the IRs and flight performance would improve. However, cell IRs still stay between 3-4mOhm (more towards 4) while my 260 flight old nanotech 25C 3000 packs have cell IRs also between 3-4mOhm but more towards 3. I did some current draw comparison between different packs. While the 3300 pulled low 80-ish amps like my Bolt Li-HV 2400 and Zippy Compact 2450 do (quite a feat for these small capacity packs), the Roaring Top 2700 didn't hit 80 mark while my 260 flight old nanotech 25C 3000 hit 89.90A! These pulls were all done after at least a minute of hovering and normal flying so as to make all packs get down to around 23.5V.

Read more on "My Nanotech Thread".
http://www.rcgroups.com/forums/showt...5#post33077935

That said, cell voltage/IR are still very well balanced while my 260 flight old nanotech packs finally start to show small cell mismatch (very small I must say consider the packs' age).
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Old 05-01-2016, 10:16 PM   #15 (permalink)
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Default Roaring Top Lipo

Having tons of fun with these packs. Just ordered two more 6S 5000 60C for the 700. These packs hold a great power delivery through the entire flight. My original 6S 3300 60C test packs have 130 flight so far in the 600 and still rock hard and solid. I then purchased two 5000 6S 60 to try in the 700, I have 75 flights on this set and since they are such a solid pack purchased another set. They prices went down a little so they are even better imho.
Give these guys a try and see for yourself that a good quality pack does not have to cost extreme prices! Thanks Junlin for a quality product!
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Old 05-10-2016, 10:30 PM   #16 (permalink)
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Default Roaring Top Lipo

Not sure if people are interested in Roaringtop lipos but I asked if they would provide a discount code for a couple heli events coming up. They gave me codes for 10% off. If anyone is interested use
OTHELLO
https://www.roaringtopusa.com
Figure I would let people know! I use them in 600 & 700 size helis and they are giving me solid performance for really good prices. Hope this can help someone! If your going to Othello, see you there!
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Old 05-25-2016, 12:30 PM   #17 (permalink)
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Thanks VTX!
I just found that the 6s 3300s that came with my 500 deal have been sitting for too long.

These Roaring Tops look like they are priced right!
I might have to give them a shot.

Quote:
Originally Posted by VTX 1800 View Post
Not sure if people are interested in Roaringtop lipos but I asked if they would provide a discount code for a couple heli events coming up. They gave me codes for 10% off. If anyone is interested use
OTHELLO
https://www.roaringtopusa.com
Figure I would let people know! I use them in 600 & 700 size helis and they are giving me solid performance for really good prices. Hope this can help someone! If your going to Othello, see you there!
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Old 06-08-2016, 01:32 AM   #18 (permalink)
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Default Roaring Top Lipo

Here is the email Junlin sent me for the fun fly discount code

the one for the Silver Hills fun fly is SLIVER HILLS . (Valid from June 15th till July 14th).
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Old 06-16-2016, 07:46 AM   #19 (permalink)
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The code is SLIVER.
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Old 06-16-2016, 09:45 AM   #20 (permalink)
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From now to end of July Roaring Top lipos are 10% off.

Use the code SLIVER, good through mid July.

Use the code JULY04 starting July 4th until July 31st.
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