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Old 12-04-11, 05:32 PM   #1
TIdeaShop@aol.c
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Post Are Turnigy nano-tech 6000 & 5000 mah battery's any good

I see HobbyKing sells 6000 & 5000 mah batteries. They sound good, lots of current for short blast up hills and reserve current for later in the day on the straight and level. Looks like you can get a lot of amps for $1000.
Terry
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Old 12-12-11, 05:43 PM   #2
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They can be good if you are able to get a long life out of them. If you get the charging or discharging wrong they die.

The way I see it- if you're asking this type of question you should use something else on a bike. Maybe get an RC car or plane to learn about them before blowing a grand.
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Old 02-01-12, 09:20 PM   #3
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It seems many Radio toy use batteries have big capacity cells over 5000mAh, but I am just wondering is it any safe of assembling by way of DIY?
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Old 02-01-12, 09:46 PM   #4
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They are LithiumPolymer batteries , read lenghtly warnings from web site which sells them, those warnings are there for a reason=LiPoly is the most dangerous battery chemistry out there, I personally would never use them on ebike. One thing to use this chemistry in cell phone, Ipod,
because tiny amount of energy, another thing to use 300-400Wattshour just less than a meter from you sitting on a bike.
Yes, I agree if you ask this kind of question it means use other chemistry to power your bike like Lithium Iron Phosphate.
Shortly itis the last chemistry battery you want to play /BUILD/
with if you don't have in depth knowledge of el. circuits.

Last edited by powell; 02-01-12 at 10:14 PM.
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Old 02-02-12, 03:44 PM   #5
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Yeah, use em I could you a good bonfire in the winter.

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Old 02-02-12, 07:53 PM   #6
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I have hundreds of LiPos. Two 10Ah 12s packs are in ebikes. I had to smash one in a rather violent heli crash to get any flames.
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Old 02-03-12, 09:21 PM   #7
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I think that advice to charge LiPOs in fireplace or stove or amunition box or any stone/ceramic surface is too much of a bother for me.
Definitely very inconvenent for me is " to attend" charging all the time and this is standard precaution from any LiPo cells vendor.
My LiFePo are left on charger when I sleep,
I don't think I would charge LiPo when I sleep , you see those all warning from vendors are there for a reason. for sure.
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Old 02-07-12, 07:03 AM   #8
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We bought 2 about a month ago from HK and one had a bad cell. We did not return it because I want to cut it open.

Their eBay store is getting poor feedback on these batteries and they are on sale cheap.

http://feedback.ebay.com/ws/eBayISAP...edbackAsSeller

http://www.ebay.com/itm/RC-Turnigy-n...item3cbeb2d9d0

I am thinking they are not high quality or just not tested.

Last edited by biker; 02-07-12 at 07:09 AM.
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Old 02-07-12, 11:01 AM   #9
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They are so inexpensive, even if the failure rate is high (say 10%) it is not that significant.

FWIW to put things in perspective I have purchased many of these for two ebikes starting 2 1/2 years ago and have yet to have a failure...
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Old 02-07-12, 01:01 PM   #10
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We wanted to do a test against my A123, Samsung pack but have not yet been able to get 2 good ones to test.

We have another one on the way but my hopes are not up.

The way they are bragged up online I had high hopes for performance.

Used A123 cells are cheaper and if one can figure out how to charge, use and build an ebike using rc cells then I would think building a pack using A123s would be about as easy.

Back it up with laptop cells and ride ! http://www.bikeforums.net/showthread...ery-A123-cells


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They are so inexpensive, even if the failure rate is high (say 10%) it is not that significant.

FWIW to put things in perspective I have purchased many of these for two ebikes starting 2 1/2 years ago and have yet to have a failure...
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Old 02-07-12, 01:10 PM   #11
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The way they are bragged up online I had high hopes for performance.
Check the specifications (internal impedance, energy density, power density) for these high-discharge-rate LiPo cells. That will tell you why they are "bragged up". Nothing against A123s in general. They are better for those who are less careful. But they aren't quite in the same league performance-wise. And you need a lot of them given their lower capacity!
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Old 02-07-12, 01:30 PM   #12
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I am only using 11 A123s and 40 Samsung 2600mah cells in my pack and think it will compete performance wise with the hk batteries in a real world 400w motor ebike test of 10 amp hour batteries.

Will let you know if we can get 2 good ones to test.

We are giving them one more try to deliver some working batteries.

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Check the specifications (internal impedance, energy density, power density) for these high-discharge-rate LiPo cells. That will tell you why they are "bragged up". Nothing against A123s in general. They are better for those who are less careful. But they aren't quite in the same league performance-wise. And you need a lot of them given their lower capacity!
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Old 02-07-12, 07:26 PM   #13
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LiPo is NOT for newbies...
I have 2 people in the past 2 months that were LiPo newbies and both their batteries and bikes caught on fire...
I say only use LiPo IF you NEED SHORT/FAST trips... For a commuter style ride/bike, nothing is better than LiFePo4 / NMC cells!
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Old 02-07-12, 09:22 PM   #14
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I agree, LPolymer are for experienced people.
THE very fact that qulity of HK cells is hit and miss tells you a lot.
Yhis spotty quality even adds to risk.
On Endless Sphere forum there many gamblers with those cells. It might nothing happen for years and al lof a sudden this day comes.
If you want crazy performance stunt/show off ebike /which usually wastes your Wattshours/ for short shows on public street and have alot of experience go for it.
But for normal commute ebike - NO
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Old 02-10-12, 07:11 AM   #15
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We cut apart the pack with the bad cell and removed it. It was shorted.

It's a 9 cell pack now.

Last time I am going to be part of something like that. I don't think they were built to be repaired.

Globby soldering job inside too.

More made in China throw away junk IMO.

The cells had nano 5000 printed on them except the one that was shorted had nothing printed on it ?

I would suggest buying 2 cell packs instead of 10 cell packs then test and solder them together yourself if that is what you want to use.

That way you can have a pack that is easy to repair.

P.S. It was a shame to see those cells put together like that.

Great specs on the cells ( except one ) but put together poorly.

Last edited by biker; 02-10-12 at 08:26 AM.
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