HK Turnigy nano-tech 25C 2S 180 UMX @1-3A - RC Groups
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Jan 31, 2012, 08:17 AM
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HK Turnigy nano-tech 25C 2S 180 UMX @1-3A

Fresh from latest shipment.

Charge 1-3 at 1C (180 mA) .charge 4-6 at 2C (360 mA) This one rated for up to 5C charges

Notice / reminder 80% is the normal DOD limit for extending LiPoly's life and all of these greatly exceeded that. As I have posted many times I most often subject test batteries to conditions well beyound what I feel is best for them.

A 180 mAh discharged at 3A is a 16.66 C discharge rate which is very close to my SOP cont. discharge limit rate as a percentage of the vendors C claim.

Last edited by everydayflyer; Jan 31, 2012 at 10:38 AM.
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Jan 31, 2012, 09:15 AM
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Hi Charles.

I am finishing a 4 engine GWS C-130 with a total load of about 10 to 12 amps. on 3 LIFE cells.
I was looking at the weight differences of 3 LIFE nanos of about 1100 mahr & 3 or 4 B & D 1100 mahr A123.
I am not finding a big difference in batteries when I consider output voltage flatness. I can & do run the 4 A123 1100mahr cells down to 15% all the time by hearing rpm changes.
I also need to split the battery pack to get a good COG point. The 123s shine there.

Am I overlooking something that tips the scale to that very sloped Nano discharge curve ?

Jan 31, 2012, 09:53 AM
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Sounds more like a what's the difference between LiPoly and LiFePO4 than a discussion about UMX class LiPolys but...............

Did you really mean

I was looking at the weight differences of 3 LIFE nanos of about 1100 mahr & 3 or 4 B & D 1100 mahr A123.

3 LiFe nanos or 3 LiPO nanos .

Back in 2008 - 2009 when I went back to flying LiPolys instead of LiFePO4 I posted both CBA test graphs and in flight data files/graphs to show the difference.
Off the top of my head ,a 3S 3300 LiPoly maintains higher volts ,more watts and longer flights trhan a 4S LiFePO4 and weight is close to same. same comaprison of 4S LiPoly and a 5S LiFePIO4.

When I first started flying LiFePO4 LiPolys capable of true 70 to 100 A. discharges were extremly expensive,were not capable of 5 to 10c charging and did not last many cycles if you pushed them fairly hard. LiFePO4 could be charged at 10C all day long ,discharged flat and last 500 cycles.

These days (last 3 years plus) I find LiPolys better meet my semi hot dog flying style and fast charging and give very good cycle life if quality packs are used and a little TLC is provided.

Here is one comparision post.

Last edited by everydayflyer; Feb 01, 2012 at 07:06 AM.
Jan 31, 2012, 12:01 PM
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HK 25C nano tech 180 and Hyperion 25C 180 compared

Honestly this comparison surprised me. Now if the nano can in fact stand up to 5C charging and still deliver good performance after numerious cycles similiar to the Hyperions I will be truely impressed.

I must say for those looking for a bargain and are not concerned with how long they last the nanos at less than half the cost of Hyperions are looking good.

The leads on the nano has silicon insulation and is thus a lot more flexiable than the pvc(?) Hyperion insulated leads. This is a very good thing IMO.
Nanos are lighter than the Hyperions also nano 10.7 grams. Hyp. 12 grams. .Note my scales are not ultra precesion at these levels but are close enough. HK list thier nanos at 10.5 grams I believe. RC Babbel came up with 11.77 garms for a lightened Hyperion . He removed the hevay OEM heatshrink and used lighter weight in its' palce.
My Hyp.were assemble by me and I used no HS.

Last edited by everydayflyer; Jan 31, 2012 at 01:02 PM.
Jan 31, 2012, 01:10 PM
Registered User
When I looked at the A123 & LIPO chart they both are flatlines.
When I look at the Nano charts they seem very sloped. I am not reading the charts correctly? Or is the TP cells so much better in general ?
I bought 2 Turnigy 2200 mahr 3 cell Nano packs as my first LIPOs. I should assume they will have the steep discharge curve ?
I will pay for a flatter discharge curve. Who has been a good supplier of TP over the years ?

Thank you.
Jan 31, 2012, 01:29 PM
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Please leave this thread for UMX class LiPolys guestions. / comments.

My 3S 45C HK Nano tech LiPoly test thread is here

Like my other LiPoy test link is in the Battery graph vault which is a Sticky.

Jan 31, 2012, 08:47 PM
Way to many airplanes!
Told you they were quite decent for the price Charles.

Few more things I may add:

- They are very good in the cold (yes, I know, I kill them by using them in -25C but who cares, they are cheap). More important, for me, that's another good sign that it's a decent battery.
- The silicone wire stay soft, even in extreme cold. Very easy to stuff in a Beast.
- If you buy them with a buddy code, they cost only $2.56 each! (but you can only buy 3 at a time)

The bad news: Mine seem to show a relatively quick internal resistance increase and I have only about 10 cycles on them. Not sure if it's normal or not, since I only started monitoring IR recently. They still work as good as day one though. Been using them only in extreme cold, so that probably doesn't help.

Thanks for your hard work as usual. This take time, and it's so great for the community. Now, time will tell how truly good those are! (That will be the most interesting part!)
Jan 31, 2012, 09:23 PM
3D... the only way to fly!
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What if a guy were to " mod" the Nanos to make them lighter... might see 9.5?
Jan 31, 2012, 10:38 PM
I'd rather be flying!
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Great info! The Nanos performed better than I expected @ 2A. Would be interesting to see how they compare to the Hyp packs @ 3-4A, since it looks like we're headed in that direction with the upcoming UMX offerings.

BTW - glad to see that you're still doing objective battery tests. I've been away from it for quite awhile, now. Thanks for your efforts!

Feb 01, 2012, 11:53 AM
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Hobby King Turnegy nano tech 25C 2S 180 UMX LiPoly life test

a couple of post above by me with initial discharge test and comments.

Now for some life cycle testing. This is a work in progress which I will update in this post. Check back to see how long it last.

New LiPoly , Charge 1-5 at 180 mA(1C) rate and discharges at 1A (5.5C) rate down to 3.6V per cell (well when first cell reaches 3.6 if they happen to get out of balance).

Cycle 1 161 mAh delivered (90%) of rated capacity
Cycle 5 161 mAh delivered ,sofar so good.

Charge rate increased to 360 mA (2C) and discharge increased to 2A (11C)

Factoid: 144 mAh X60/2A = 4.2 min . discharge time.

Cycle 6 149 mAh delivered Note : 80% of 180 is 144 mAh so right at the suggested DOD.
Cycle 10 148 mAh delivered.

A few cell IR notes for those who follow such.
Charge #2 @ 1C 62.1 and 61.1 @ 72F.
Charge # 13 now at 3C charge rate 62.7 / 62.4 @ 73F.

Charge rate now at 540 mA (3C) and dsc. still at 2A (11C) Still using LVC of first cell to reach 3.6V
Dsc. # 11 148 mAh delivered
Dsc. # 17 147 mAh delivered

Charge #16 at 3C (540 mA) required 20:25 on one of my FMA Power Lab 8s which I am using for these test.

15 cycles completed and battery should be ready for its' full rated charge rate so next series is 5C (900 mAh ) and 2A Discharges.

5C charges and 11c discharges

Charge time 13:12
(just to point out that higher C rate charges are faster indeed with decent LiPolys and good chargers. Yes Virginia the batteries and charger does make a difference.

D# 16 146 mAh
D# 20 145 mAh
D# 25 143 mAh Both cells are still perfectly balanced down to 3.6 LVC and recover to 3.7XX during 5 min.CD (cool down)
D# 35 143 mAh
D# 40 142 mAh ( D# 38 was 144 & D# 39 was 143) Cell #1 appears to be fading ever so slightly.
D# 45 141 mAh
D# 50 139 mAh

Last edited by everydayflyer; Feb 02, 2012 at 10:43 PM.
Feb 01, 2012, 12:38 PM
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Keep up the good work Charles.....................
Feb 03, 2012, 03:47 PM
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HK Turnegy nano tech 25c 2S 180

OK first off two differnt LiPolys were used for this test. I merely compared the first LiPoly at D#6 (3A) ,see post #1 to the second one at 3A after the cycle life test on the second LiPoly.

I must say that I am very pleasantly surprised. The deep of discharges were limit to 80% however as the more detailed text in post above shows many of the charge cycles were at 5C and most of the discharges were at 11C.

If HK maintains quality control on these they are going to be unbeatable both performance and price wise.

Added for clarification. By these I mean these 25C 32S 180 nano techs , I am not refering to any other of the nano techs or even any other of the HK LiPolys.

Cell inbalance after D#51 to 3.3 per cell and cells were recovering was 0.050
cells at 3.666 / 3.616.

Last edited by everydayflyer; Feb 04, 2012 at 05:17 AM.
Feb 03, 2012, 04:55 PM
Way to many airplanes!
Thank you Charles... I have a huge stack of those batteries. Absolutely love them, but since I do parallel charging, I never tried 5C charge because I didn't really had too. Looks like they can take it, which is a bonus! At 50cycles with 3amps, they are already a decent deal enough, particularly at $2.54 each with a buddy code. From now on, it's pure gravy! Do I hear 100cycles? (That's not something I would bet on for sure! ) Again, I know it's a lot of work, so thanks!

One more comment: NanoTech batteries are a pain in the b.... to solder together if you want to make your own packs, so they are not simply Hyperion or Thunder Power with a different label on them (no way they come from the same factory). The metal they use is definitively different than the other two. You can solder Hyperion with pretty much anything, without applying too much heat. For the NanoTech, I had to use flux, quality solder, a very good soldering iron, and scratch the tabs a bit. And even then, I still had to apply too much heat for my liking.
Last edited by RealGambler; Feb 03, 2012 at 05:01 PM.
Feb 03, 2012, 05:32 PM
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Post #10 has the cycles data ,cycle #6 was the first at 2A (11C) dsc. and cyc;e #16 was the first at 5C charge but stll great performance.

This test should be enough to show that 5C charging does not severely damage / cut short their life and that perhaps it is worth the effort to limit DOD to 80%.

Everyday price is $5 and that means even only 50 flights is $0.10 per flight and it sure looks like it has many cycles (flights ) left in it. Need to put some velcro on it and do some burning and turning with it in my Stryker 180 if I can pry myself away from flying my latest toy which is a Mini Gremlin but that is another story.

Feb 03, 2012, 06:46 PM
I'd rather be flying!
turboparker's Avatar

Great work, as usual! Finally, it looks like there is a lower-cost alternative to Hyperion that doesn't compromise flight-performance. Even if the cycle life turns out to be considerably less than Hyperion, they'd still be a good choice for those who abuse their packs.


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