12-08-2008, 07:12 AM
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Join Date: Nov 2008
Location: Toronto, Ontario
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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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12-08-2008, 07:54 AM
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Join Date: Jan 2007
Location: Toronto,Ontario
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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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12-08-2008, 08:08 AM
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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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12-08-2008, 08:46 AM
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Join Date: Mar 2003
Location: Ottawa, Ontario, CANADA
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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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12-08-2008, 09:45 AM
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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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12-08-2008, 11:01 AM
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Quote:
Originally Posted by jcr
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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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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12-08-2008, 05:52 PM
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wow using copper braids (desoldering stuff), works great!
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12-08-2008, 08:52 PM
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Super Moderator
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Join Date: Mar 2003
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Quote:
Originally Posted by jcr
wow using copper braids (desoldering stuff), works great!
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Yup.....weighs virtually nothing, cuts easily with scissors, very flexible, etc... Great stuff and dirt cheap too.
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12-17-2008, 09:35 AM
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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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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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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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12-17-2008, 10:22 AM
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Quote:
Originally Posted by jcr
ok cool, so that means around 1-2A in general for 2/3A.
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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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