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[ashok baijal]

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looking for a few Nanotech lipos. Has Hobbyking stopped sending lipos to India? I am unable to place an order with Hobbyking for lipos though earlier I had got them. Any idea?

[vibranthobbies]

Edit: Sorry sir wrong post. Deleted.

[IndianHobbyShop]

As far as i am aware, HK is still shipping LiPo's to India.
What size and Capacity is required?

We do have quite a few LiPo's from HK in stock at the moment:
http://stores.ebay.in/Indian-Hobby-Shop/Lipos-Chargers-/_i.html?_fsub=5023662013&_sid=1125855133&_trksid=p4634.c0.m322

[ashok baijal]

Thanks Pravesh for the info. A typo error in the pin code and I tried umpteen times to place an order without success till Pravesh. After the correction was able to select dhl.

[parichya.gautam]

they still do, just that its shipped by fedex now, i bought 2 lips to see hows things are, if manageable, will bring more .

[sanjayrai55]

Ashok-ji, I don't know your experience, but mine has been Turnigy Nano-Tech are over-rated. They swell up easily without the user over-discharging by drawing current beyond capacity, and partly lose the current capacity in one or the other cell soon.

I haven't used the very high end LiPos like Gen Next etc., but IMHO the Ind Power RCD sells are very rugged. I've used them, Nano-Tech, Turnigy and Zippy so far.

[Himadri Roy]

Agree with Sanjay Sir NanoTechs are quite overrated if your lucky then you're battery might last more than 10 cycles...mine died in the 2nd cycle(wont charge and puffed up like a pillow! ) Turnigys are good batterys(currently have! Delivers more than expected! )
I would say go for the Rhinos they are good quality and cheap and AWESOME! Full "paisa waasool"!(my experience! )

[IndianHobbyShop]

The advantage of Nano-Techs over others is that they come with the least amount of voltage sag under rated load.
Once can easily see noticeable amount of difference in performance between a regular and a Nano Tech of same capacity and C Rating under high amp consumption environments like 3D Flying.

While a regular LiPo is able to provide the Rated current when required, it's voltage sags a lot during the entire cycle as your model demands amps.
In Nano techs, Voltage sag is minimal during the initial and mid range but towards the end of the capacity, the voltage sag increases rapidly and is quite high at this stage when compared with regular LiPo's.
In simple words Nano Techs does loose voltage too rapidly during the end.
Because of which it's possible for them to go below Safe minimal voltage in no time, hence the reported issues.

Use Nano Techs only for high amp consumption environments with a LiPo alarm set at a high 3.9v certainly helps.
For regular usage, regular LiPo's are the best bang for buck. 

[pravesh736]

Nanotechs have high qc issues and setting 3.9 volt for lv is just foolish. Because in high amp usage under load lipos are suppose to handle fine at even 3.4-3.5 which is required in edfs and 3d(not so much).
That lipo is plain hype.
Quality lipos hold its voltage fine.

[IndianHobbyShop]

Foolish even for someone getting their LiPo puffed due to Excessive discharge?

You have to understand that when you talk about top spec in just about anything, you can't have best of everything. It's always win-lose situation up there.
You win on "Minimal Voltage Sag" with Nano-Techs but you get the drawback to steep voltage drop at the end of cycle.
What's foolish in stopping off early with it?

The more you go below the nominal voltage of 3.7 volts per cell on a LiPo, the more you are calling for trouble.
The steep end discharge curve of Nano Techs make the matter worse for people who continue to fly at LV (not understanding the concept involved with nano Techs) and primarily they are the ones who complaint about it.

You have to understand that there are more of beginners than Advanced fliers like you on RCI who can't land in a jiffy.
Putting up a straightaway advise of "LiPo handles fine at 3.4-3.5v" will make them continue to fly beyond the nominal voltage of 3.7 volts per cell which will result in lower cycles that they can get out of their packs.

Tired of people straightaway giving advise intended for experts (without mentioning so) and not realizing the impact it can have on beginners.
Same goes for Parichya advising beginners to fly on CF Props not realizing the grave danger involved with it.  

About QC issues of nano tech, as far as i am concerned, i don't find it to be true.
Out of all of the HK LiPo's that we check IR of upon receiving stock, Nano techs always shows the best readings.
Way better than regular LiPo's.

http://multirotorforums.com/threads/nano-tech-lipo-low-voltage-warning.246/


"Quality lipos hold its voltage fine."
Please do some bench test before making such declarations. You will be shocked to see the results.

[IndianHobbyShop]

Recently one of our customer got a B6 Clone from us. Used it a couple of times by supplying Power to it by a Car Battery.
And one day accidentally connected the terminals in reverse polarity which resulted in the IC burning off. Then he returned the product to us and claimed that he don't want to keep such cheap Chinese product Not realizing that almost every product is made in china.

Same goes with people who compare Haiyin and Turnigy LiPo's not understanding that they both are actually made by Haiyin and essentially are different stickers on the same product.

What's disheartening to see is that some people lacks in understanding Technology, Lacks in Knowledge about something and they straightaway put blame on others.

[pravesh736]

U need to use/test more different types of lipos and then Ul understand. There are top or better lipos for similiar cost out there that hold voltage fine thru out its range and don't puff etc issues of nanotech.
Yes all good lipos, they drop quickly past their cycle but they are fine with 3.3-3.5 under load meaning 3.7 resting which is their safe limit. And then only they drop their voltage like crazy.
I have used most hk lipos, local ones, Hyperions and Kypoms
3.5 under load which 90 percent of good lipos are fine with. Resting is 3.7v. Excessive discharge happens past 3.5v in quality packs. cannot talk of excessive dischage at 3.9v
Good lipo sags .1-.2v while bad ones sag a lot more(.5-1v)
My turnigy sagged to 3v under load and jumped to 3.5-3.7 resting.
Nanotech is just a lipo with a delayed voltage sag.

It is foolish to set lvc at 3.9 as without load it would go to 4v Atleast. That is not even 40 percent discharge used. My advice was for beginners to not get fooled thinkin why they have such less runtime. Experts don't need advice on these things. Maybe less theory will help.

[pravesh736]

Returning the clone charger was the customer playing smart.
Also in China there are 4-5 lipo factories only, all rebranding, quality depends on how much contractor is paying. The better ones of the lot become 40c while faltu ones become 20c.

[ashok baijal]

Interesting discussion.
I had got two new lipos from uae recently and I was planning to use them in my hex. Unfortunately I charged the lipos and got no time to try them out. 15 days later when I picked up my hex, both lipos were puffed and ready to be scrapped. My mistake for having left them fully charged. So both my new lipos went bad after the first charge. Lesson learnt never charge lipos unless you are ready to go flying
By the way, I have already placed order for nanotechs on 2nd May itself before forum members voiced their issues on nanotech. Keeping fingers crossed that I do not end up with duds as happened to the pair of lipos I had got recently.
Guys, keep up the discussion for best practices for using lipos.

[Himadri Roy]

Sir if your using a charger like the B6 Imax or turnigy accucell you could use the storage voltage feature if you intend to store your lipo for long!

[K K Iyer]

@himadri roy,
Yes, sir.
Had lipos working fine after six years storage at around 3.82-3.85.
And also lipos puffed and failed after six weeks storage at full charge.

[Himadri Roy]

"Sir"?
Iyer Sir I'm 17!!!
I may be probably "50 so years younger" to you (Guessing by seeing your photo with Gusty Sir )

[K K Iyer]

The "Sir" is sometimes used for emphasis...

[Rcjabalpur]

I have zippy compact 3s 2200 mah lipos , they have besn with me for over an year now with more than 50 cycles in one of them , the other one has 20 cycles and one is nib , none of the three batteries are either puff or show any sign of aging . Its all about how you treat them , i set my alarm at 3.8 so that even if i miss on my first approach i can cone around for an other , the two which are being used are always balanced charged and after use they are balance abd stored . I also had a 3s 1350 thunder power pack which i had to throw away after SEVEN flights , reason i dint knew much about them back then , so at the end treat your lipos well and they will give you a long battery life .

[IndianHobbyShop]

Exactly, Fly with LiPo Alarm set at 3.8v and Store at 3.8v and you will always get the best life out of your LiPos.
Guesswork, Counting minutes/Seconds, etc are not that reliable.

Some people tend to fly late till 3.5-3.4 or even past that and usually they face issues like reduced life and performance of the packs.
I too have several LiPo's that i use for personal flights which after ~3 years of usage show zero sign of puffing. Their capacity certainly have decreased with continued usage though which is perfectly normal.

[ashok baijal]

@Himadri Roy
I have a Hyperon Charger. It was bought many years back but rarely used as I had go through a "Banwaas" from aeromodelling for a long long period. It was amongst the better ones but it does not have a storage feature unlike the newer generation chargers. So I am supposed to discharge the battery manually before storage which, being an involved task, keep forgetting/postponing till I end up with puffed lipos.