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Old May 01, 2013, 01:46 PM
My RC builds in my profile.
daign's Avatar
United States, CA, Los Angeles
Joined Feb 2011
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while amazing, and you're pushing limits. Doesn't look too fun
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Old May 03, 2013, 03:27 PM
Alicante, Espańa
Joined Jun 2010
361 Posts
I would like to buy some of this batteries and make a pack. Could you tell me where did you bought this batteries and how did you made the packs (how did you solder them).

Great flight!!
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Old May 03, 2013, 03:32 PM
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Austria, Niederösterr., Eggenburg
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I got them from amazon.de (just entered NCR18650B)
http://www.amazon.de/Panasonic-Indus.../dp/B00AIOK9BS
one cell is about 9€

I did not solder them, I made the pack using copper contacts, made out of desoldering braid (hope this is the right word). I think I am not skilled enough to solder these cells.

best regards

Ferdinand
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Old May 04, 2013, 03:21 AM
Alicante, Espańa
Joined Jun 2010
361 Posts
Do you understand that your idea of using a lilo battery is an innovation?.

Everybody is going to use this batteries now. How did you hd the idea?
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Old May 04, 2013, 03:37 AM
Alicante, Espańa
Joined Jun 2010
361 Posts
What do you think about this ones ?

http://www.aliexpress.com/item/20pc-...630011325.html
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Old May 04, 2013, 04:12 AM
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Joined Dec 2007
542 Posts
fyi...

im playing with these batteries (not for any records, but an fpv 'flier' with 12x4.5", 750kV and AUW of around 1500grams)...

x4 of these suckers at 3S:

10,000mAh
588grams including wire, plug & case
5C Constant / 10C Burst

= 17.00mAh / gram

and they cost about US$14 each

http://www.hobbyking.com/hobbyking/s...Lipo_Pack.html

Quote:
Originally Posted by MayMayDay View Post
Interesting. Does LiIon have better storage capabilities per unit weight? For your batteries:

13600mAh/770g = 17.67mAh/g

Compared to a Turnigy Nano-tech 4S 6000mAh http://www.hobbyking.com/hobbyking/s...Lipo_Pack.html

6000mAh/623g = 9.63mAh/g

What's the catch? I've don't know anything about LiIon. I'm guessing discharge rates are really low? But with that size, you don't need a really high C rating.
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Old May 04, 2013, 04:30 AM
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Austria, Niederösterr., Eggenburg
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@catamar
These cells are 100gr, the Panasonic is 50gr

@ed_jza80
These Lipos have good specs, but your numbers are 3S the numbers you cited are 4S.

best regards

Ferdinand
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Old May 04, 2013, 05:19 AM
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United Kingdom, Scotland, Glenrothes
Joined Mar 2013
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Quote:
Originally Posted by EndOfDays View Post
I got them from amazon.de (just entered NCR18650B)
http://www.amazon.de/Panasonic-Indus.../dp/B00AIOK9BS
one cell is about 9€

I did not solder them, I made the pack using copper contacts, made out of desoldering braid (hope this is the right word). I think I am not skilled enough to solder these cells.

best regards

Ferdinand
Hi. What is the max discharge rate for these batteries? How do you recharge them?

Thanks.
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Old May 04, 2013, 05:26 AM
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Romania, Dolj, Craiova
Joined Sep 2007
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Quote:
Originally Posted by catamar View Post
Do you understand that your idea of using a lilo battery is an innovation?.

Everybody is going to use this batteries now. How did you hd the idea?
The innovation is to use them in parallel, not liIon usage itself.
Evaluated the usage of these cells long time ago with timecop in a skype chat, but the maximum current of 5 Amps stopped us to start project.

Now I will come with other innovation: use 18mm ID 0.5mm wall CF tubes for arms, and place cells inside for a more compact setup. The 4p setup translates into each arm embedding its own 3-4s pack.
Or, a not so much expensive alternative, titanium tubes with 0.2mm wall thickness, lighter and more resistant than equivalent CF tubes, and same price ballpark.
I donate this idea for a beer to anyone want to use it
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Last edited by renatoa; May 04, 2013 at 02:46 PM.
Old May 04, 2013, 06:34 AM
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Austria, Niederösterr., Eggenburg
Joined Jan 2010
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@catamar,

This is not an innovation, it is "just" a battery with some specs, and if you have a setup that allows you to fly more that 60min, you are withing the specs of such a cell, so it is possible to use them. If you have a more standard setup with shorter flight-time, this setup will not work (the max. discharge rate is 2C).

The LiIon Cells can be recharged with a standard charger. I recharge at 0,5C, and I balance the pack.

best regards

Ferdinand
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Old May 04, 2013, 06:42 AM
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Romania, Dolj, Craiova
Joined Sep 2007
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Ferdinand, unlike alkaline batteries, the contacts of these rechargeable lipos are not part of battery body itself, and tin they are made is very easy to solder, just try on a cell.

Will increase the reliability, the mesh solution, even if ensuring multiple contact points due the sponginess nature of the coper mesh, is still not permanent contact, and unsafe in a vibration environment.
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Old May 04, 2013, 08:09 AM
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Austria, Niederösterr., Eggenburg
Joined Jan 2010
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abused the copter to carry a gimbal:
BG-Gimbal for Sony CX250 first test flight (1 min 46 sec)

estimated flight time would be 40min (with the gimbal)

best regards

Ferdinand
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Old May 04, 2013, 01:53 PM
Registered User
Joined Apr 2013
38 Posts
Quote:
Originally Posted by ed_jza80 View Post
fyi...

im playing with these batteries (not for any records, but an fpv 'flier' with 12x4.5", 750kV and AUW of around 1500grams)...

x4 of these suckers at 3S:

10,000mAh
588grams including wire, plug & case
5C Constant / 10C Burst

= 17.00mAh / gram

and they cost about US$14 each

http://www.hobbyking.com/hobbyking/s...Lipo_Pack.html

Hello

How do you connect the four batteries ?
Do you simply connect the batteries in parrallel or do you use any electronic to connect them ?

There are no balance problem ?

Thank you for your help !
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Old May 06, 2013, 02:41 PM
Alicante, Espańa
Joined Jun 2010
361 Posts
Hello,

How is the connection of the balancing cables?. Where do I have to connect them to make a balancing connection, like the one seen in the pictures?
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Old May 06, 2013, 02:48 PM
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Joined Dec 2007
542 Posts
Quote:
Originally Posted by WalkOver View Post
Hello

How do you connect the four batteries ?

There are no balance problem ?

Thank you for your help !
ive been running a twin setup for a while, and i just have them in parallel. nothing fancy. they discharge all ok, balance has never been a problem

i dont anticipate anything strange with increasing that to 4
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