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Old May 06, 2013, 02:52 PM
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Romania, Dolj, Craiova
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Quote:
Originally Posted by catamar View Post
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?
4s4p, this say everything.
Four clusters in series, each of them being four cells in parallel.
Think each four parallel cluster as a single bigger element. The balance wires are the intermediate plus-to-minus connections, as in a 4s lipo.
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Old May 06, 2013, 03:38 PM
Alicante, Espa˝a
Joined Jun 2010
379 Posts
Thank you Renatoa. Understood.

Quote:
Originally Posted by renatoa View Post
4s4p, this say everything.
Four clusters in series, each of them being four cells in parallel.
Think each four parallel cluster as a single bigger element. The balance wires are the intermediate plus-to-minus connections, as in a 4s lipo.
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Old May 07, 2013, 04:31 PM
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United Kingdom, Scotland, Glenrothes
Joined Mar 2013
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Quote:
Originally Posted by renatoa View Post
4s4p, this say everything.
Four clusters in series, each of them being four cells in parallel.
So....

4x3400mah cells in parallel = 1 cluster = 1x1S (3.7v) = 13600mah @ 200g

4x1cluster in series = 1x4S (14.8v) = 4x3400mah = 13600mah @ 800g?

Thanks.
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Old May 08, 2013, 09:12 AM
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Romania, Dolj, Craiova
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Close, he wrote his cells have 48 grams. So 32 grams less.
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Old May 12, 2013, 03:34 PM
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Austria, Nieder÷sterr., Eggenburg
Joined Jan 2010
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Here a video of 57min FPV with this quad. I could have done more than 60min, but I made a small flight before (with the same battery) to get some shots of the quad for the video:
12mm Frame Quad big FPV endurance test 57min (7 min 2 sec)


best regards

Ferdinand
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Old May 12, 2013, 04:26 PM
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Minneapolis
Joined Jun 2002
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Quote:
Originally Posted by EndOfDays View Post
@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
Funny, I've been using the same battery for years in electric RC. We got them from older cell phone packs. I have a 3 cell pack in my 9CFutaba and even a special charger for them.

Great work flying that long, you know your stuff for sure.
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Old May 12, 2013, 05:39 PM
Flying Wood For Fun
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Canada, ON, Harrowsmith
Joined Jan 2012
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Wow!!! and I was happy with 18 minutes lol

good job!
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Old May 12, 2013, 05:58 PM
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United Kingdom, Scotland, Glenrothes
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Quote:
Originally Posted by EndOfDays View Post
Here a video of 57min FPV with this quad. I could have done more than 60min, but I made a small flight before (with the same battery) to get some shots of the quad for the video:
https://vimeo.com/66010657

best regards

Ferdinand
That's fantastic!
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Old May 12, 2013, 07:14 PM
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VA
Joined Nov 2009
2,658 Posts
Ferdinand with all the super low kv motors out now perhaps one of the 120 turn gimbal motors would be enough rpm on 4s
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Old May 13, 2013, 06:34 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
3,873 Posts
This is awesome!
I may have to build a pack for my flying wing... Its peak Amp Draw is around 10A so a 3s3p should give around 15A Peak?

at that I would get a 10.2Ah pack for only around 440g! Right now I can fly for 45 minutes on 2200mah that is 190g and some dead nose weight... I could easily add this pack in.

Does anyone know the lifespan of the cells?
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Old May 13, 2013, 07:05 AM
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They are the same as used in laptops, so some years, hundreds cycles.
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Old May 13, 2013, 07:46 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
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nice! gonna order some friday!
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Old May 13, 2013, 07:59 AM
CrashMaster
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United Kingdom, Brentwood
Joined Dec 2012
118 Posts
How about taking cells out of something like the Lenovo Slice:- http://shop.lenovo.com/us/itemdetail...47BFB52CC4F8E9
That would give 64Wh 19v and the weight, even in the casing, only 370g.

A little expensive but may be well worth the trouble and expense if someone knows how to do it and configure the cells contained in the casing and hook up suitable motors and props.
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Old May 13, 2013, 08:08 AM
Mobius Cables... I got em'
chanyote66's Avatar
United States, TN, Oak Ridge
Joined Dec 2011
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370 is the width... the weight is 940g
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Old May 13, 2013, 08:20 AM
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Romania, Dolj, Craiova
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lol, he already seen himself in the sky for hours

Actually 64Wh 340 grams is not terrible, this means close to 200W per kg, which is the energy density of MaxAmps.
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