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  #1  
Old 12-08-2008, 07:12 AM
jcr jcr is offline
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Building 2/3A 3x2 configuration

I'm thinking of building my own battery pack from 2/3A loose cells and in this configuration:
http://www3.towerhobbies.com/cgi-bin...?&I=LXMUE4&P=7

My question is how to do solder or contact the two cells that is going from head to toe? The others I know you use battery bars.
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  #2  
Old 12-08-2008, 07:54 AM
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another pack design you can do is:

http://www3.towerhobbies.com/cgi-bin...?&I=LXMUE5&P=7

Then you would just have to bend 4 battery bars to a 90* bend and one to join the two sides. I used this similar design for my crawler battery packs (3 on each side of the axle pumpkin). I also have 2 packs of that design for my gf's micro and I believe that is how they are wired..heh.

As for soldering the batteries pos to neg directly, the only way I have seen is with a "hammer head" tip and having the cells lined up and slide it down quickly so it sticks.

just found the vid on youtube:
http://www.youtube.com/watch?v=Ak2b7svVCYA
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  #3  
Old 12-08-2008, 08:08 AM
jcr jcr is offline
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well one of my chassis has the cut out for the 3x2 configuration so that's why I'm thinking of using that design. I'm also trying to commonize the battery pack configuration between the two cars so I don't need to buy extra batteries that I don't need.

The link you sent me would probably work better on the car that has no cut out for batteries. Do you know how much are these battery locally? Online I've seen it for $14-20 but our currency sucks right now...
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  #4  
Old 12-08-2008, 08:46 AM
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Use battery braid to solder the two cells side-by-side and then just rotate until they are nose to tail. I like the braid sold at Radio Shack as desolder braid. It's nice an thin and works very well.
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Old 12-08-2008, 09:45 AM
jcr jcr is offline
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hmmm... not a bad idea since the braid is very flexible. Then just glue the cells together? Might have to give that a try later this week.
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  #6  
Old 12-08-2008, 11:01 AM
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Quote:
Originally Posted by jcr View Post
hmmm... not a bad idea since the braid is very flexible. Then just glue the cells together? Might have to give that a try later this week.
I recommend Shoe Goo to stick the cells together as it holds very well and should you ever need to reconfigure, it can be taken apart without damage to the cells.
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  #7  
Old 12-08-2008, 05:52 PM
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wow using copper braids (desoldering stuff), works great!
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  #8  
Old 12-08-2008, 08:52 PM
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wow using copper braids (desoldering stuff), works great!
Yup.....weighs virtually nothing, cuts easily with scissors, very flexible, etc... Great stuff and dirt cheap too.
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  #9  
Old 12-17-2008, 09:35 AM
jcr jcr is offline
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Just got two packs of Intellect 1200mAh 2/3A 6 cell batteries in this configuration. Have no vehicle test them yet but through charge cycling, it seems to be holding a good charge.

How much current do you guys normally charge 2/3A batteries?

First pack: charge at 1.0A with charge capacity of around 1800mAh. Discharge at 10A? with a capacity of around 1200mAh

Second pack: charge at 1.1A with charge capacity of around 1550mAh. Discharge at 10A? with a capacity of around 1100mAh.

In general, charging at high current should have a lower capacity but also a higher "punch" due to higher average voltage. But how much current is a good rate for 2/3A? With SC cells I've normally done 5.0A.
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  #10  
Old 12-17-2008, 09:39 AM
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Smaller cells can't take the same type of abuse that the larger Sub-C cells can and I prefer to charge in the 1C to 2C range.
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  #11  
Old 12-17-2008, 09:57 AM
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ok cool, so that means around 1-2A in general for 2/3A.
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  #12  
Old 12-17-2008, 10:22 AM
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Originally Posted by jcr View Post
ok cool, so that means around 1-2A in general for 2/3A.
If you have the newer 1500 cells, then a charge rate between 1.5amps to 3 amps should be fine. Always check to make sure the cells do not get too hot. NiMH cells do not like heat.
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