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Old Sep 26, 2010, 11:49 PM
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Question
Nanotech vs regular lipo's

Pretty noob here to the hobby, but I know that the nanotech batteries charge must faster than regular lipos, but how exactly do they compare in flight time duration?

For example, what would the difference be for 11.1v 1300maH for both battery technologies flying under the same conditions? (this is for a flying wing platform)

thanks
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Old Sep 27, 2010, 02:11 AM
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The advantage is lower internal resistance, which means higher voltage especially under high loads and capability for more ultimate power (ie burst discharges up to 60C or even 90C). Potential colateral advantage is longer life duration as the cells have slightly less strain for a given application.
Size / form factor may be another point of interest.

But for most users, most good standard 20/30C cells will be plenty good enough and you will never see the difference for mild setups.

You see the difference if you push towards the limits, that only 0.5% of users take real advantage of: 3D helis, high power gliders, pylon racers and some EDF mainly...
For example F5B setups use up to 400A+ out of 3650 mAh cells.
FYI, my 3000 mAh Flightmax 40C already deliver easily up to 176A for 3-5 seconds bursts on a glider... Good enough cells already (they might actually have these "nano" spacers already embedded inside as I heard most good 35+C cells since over a year may actually use this building technology - I don't know if this is true)

You can charge also at up to 10C the nanos, assuming you have a charger and power supply that can deliver... Better have 2-3 packs and charge @ 2-3C IMHO.
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Old Sep 27, 2010, 09:59 AM
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Quote:
Originally Posted by dezerteagle323 View Post
Pretty noob here to the hobby, but I know that the nanotech batteries charge must faster than regular lipos, but how exactly do they compare in flight time duration?

For example, what would the difference be for 11.1v 1300maH for both battery technologies flying under the same conditions? (this is for a flying wing platform)

thanks
Practically speaking - none to little
I don't think you'll see any difference between a 20C non-nano and a 25-40C nano under a 6-10min flight profile. That's a 6-10C draw.

Besides, how much of the nano stuff is just sales hype?
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Old Sep 27, 2010, 08:48 PM
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Ok thanks for clearing that up.

So for someone like me who's just gonna be doing mild/stable flying, the only real advantage here with the nano's is their quick recharge time and lighter weight, correct?
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Old Sep 27, 2010, 09:24 PM
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Most are heavier though. But the real advantage is quick recharge.
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Old Sep 28, 2010, 07:29 AM
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Quote:
But the real advantage is quick recharge.
Faster charge rate LiPolys are not new and they do not need to be nanao to have this capability.

Thunder Power Pro lite LiPolys have been 3C charge capable for nearly 4 years now. Many newer (last year or so ) Thunder Powers can be charge at 4-10 , Hyperion G3 series have been 5C charge capable for around two years now.


Over the past 4 years I have started several threads on charging at greater than 1C but most often all the nay sayers come along and wave their safety banners.

Charles
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Old Sep 28, 2010, 07:42 AM
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Quote:
Over the past 4 years I have started several threads on charging at greater than 1C but most often all the nay sayers come along and wave their safety banners.
We hear this with every new product too... but afterall, trying new things and experimenting with new methods is how we come up with new products, right?
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Old Sep 28, 2010, 07:55 AM
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Post made March. 2006 showing 1-3C charge results

http://www.rcgroups.com/forums/showp...&postcount=483

More recently 300 cycles at 5C charge rate.

http://www.rcgroups.com/forums/showthread.php?t=1142882
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Old Sep 28, 2010, 08:32 AM
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Quote:
Originally Posted by everydayflyer View Post
Post made March. 2006 showing 1-3C charge results

http://www.rcgroups.com/forums/showp...&postcount=483

More recently 300 cycles at 5C charge rate.

http://www.rcgroups.com/forums/showthread.php?t=1142882
one trick pony.............. promoting ThunderPower
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Old Sep 28, 2010, 09:31 AM
Southern Pride
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From post #6 above

Quote:
Hyperion G3 series have been 5C charge capable for around two years now.
Simple facts are that Thunder Power was one of the first with greater than 1c charge capable LiPolys and one was cycled at 3C charge rates for 600 cycles approx. 5 years ago but no point in posting link as it would just be dismissed by many.. The point of my post was to show that HK nano techs with their greater than 1C charge rates are not the first.

Kokams were the very first advertised as being capable of 3C charge rates when using the FMA Cell Pro 4 however some of the very early results were not that great.

I would love for someone to do 300 cycle testing of the HK nanos at 5C charges and 16C discharges but no one seems that interested in doing so. No point in me doing it as to many would question my results. I posted less than stellar results of a nano tech 45C and most posted I got a bad one.

http://www.rcgroups.com/forums/showt...=everydayflyer


Another user posted similar results so his must have been a bad one also. A well respected by many tester tested one and then some posted some negative comments,

http://www.rcgroups.com/forums/showp...&postcount=483


http://www.rcgroups.com/forums/showp...&postcount=486
Charles

Some of my LiPoly test thread since May which include Thunder Power,Hyperion,Billowy,GenAce

http://www.rcgroups.com/forums/showp...8&postcount=41
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Old Sep 28, 2010, 10:34 AM
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Nanotech is better![img]/sig/31/smile.gif[/img]
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Old Sep 28, 2010, 11:01 AM
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I have been charging NeuEnergy lipos for well over a year now at 5c and the lipos I have seem just as good as when I first got them.
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Old Sep 28, 2010, 12:12 PM
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What is nanotech?

Hello
What is nanotech? I have heard of it but have no clue...

/Ville
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Old Sep 28, 2010, 12:16 PM
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Originally Posted by liukku View Post
Hello
What is nanotech? I have heard of it but have no clue...

/Ville
Marketing hype. Knowing HK, they took another one of their lipos, and stuck another pretty label on it.
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Old Sep 28, 2010, 02:23 PM
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Well I've run an 1800 3s 25-50c nanotech pack vs an 1800 3s 30c turnigy pack and noted that there was MORE voltage drop with the nano's at both a fresh charge (12.5v) and discharged to 3.8v/cell (11.4v). The lighter nano weight did not overcome the drop in power (AUW of the plane was 701 with nanos, 716 with non-nano). The load was ~23 amps freshly charged and 20 @ 11.4v so it should be *well* within the rating of the nanotech cells (less than 13c !!!) and yet the overall watts dropped from ~270 down to ~260. Bad pack?
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