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Century Radikal E640 - Swift 16 NX
› Kokam battery connector for Hummingbird
12-20-2003 04:15 PM  13 years agoPost 1
BeauGM

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Myrtle Beach, SC

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I just got a Kokam 2s 1500 mAh and it came with a Deans Ultra connector. Should I CAREFULLY cut the Deans off and install a connector that will match up to the hummingboard? This would still allow me to use the 2 birdseed packs that I have. Or shoud I cut the connector on the hummingboard and install a Deans there? The Deans is better, but it is larger and klunkier. Will the original hummingboard connectors hold up to the Kokam?

-Geoff

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12-20-2003 04:52 PM  13 years agoPost 2
Randall

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Oliver BC

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Go with the Deans, they are better quality. Get yourself a bunch of them and start converting everthing over.
Mind you, once you start flying with Li-poly you likely won't be using the birdseed batteries much any more even if you do put the deans connectors on them.

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12-20-2003 06:37 PM  13 years agoPost 3
SkaterX

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Canada

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http://www.wsdeans.com/products/plugs/micro_plug.html

Get the Deans micro plugs, they work great... just buy a bunch of the red ones!!!

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12-21-2003 02:04 AM  13 years agoPost 4
Gazoo

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Maryland

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I agree 100% with SkaterX. Deans micro all the way!

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12-21-2003 02:12 AM  13 years agoPost 5
rickc

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Creve Coeur IL. (Peoria Area)

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The Deans Ultra is a huge over kill. Remember weight is a big factor in micro's. Some do all they can to shave a gram here and half gram there. A JST connector will do fine.

Rick

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12-21-2003 02:33 AM  13 years agoPost 6
Gazoo

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Maryland

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A JST connector will do fine.
I don't think the Deans micro connector weighs any more than a JST connector. Another advantage is that there is less current loss across the Deans micro connector and it does not wear out nearly as fast as a JST.

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12-21-2003 02:54 AM  13 years agoPost 7
rickc

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Creve Coeur IL. (Peoria Area)

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He's not pulling a Hacker, loss... LOL What? 10 rpm? 5 seconds of flight or most likely no loss at all? I have many Kokam, E-Tecs and LiteFlite packs. I can pull 6 amps for the entire flight and there is no temperature increase in the connector but the packs will be warm. Meaning not enough resistance to be concerned about. I won't argue the Dean's Micro I'm sure may be a better choice. But the JST is industry standard and will do a very nice job. Most Li-Poly packs come with the JST.

Rick

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12-21-2003 03:12 AM  13 years agoPost 8
Gazoo

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Maryland

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What? 10 rpm? 5 seconds of flight or most likely no loss at all?
Any loss that can be prevented is good as far as I am concerned. I did notice heat on the JST connector after it had been used awhile. And I also measured a voltage drop but I can't remember off hand how much it was. In addition having the best connectors possible will ensure the best charging. After noticing these things I will not use JST's again. I did notice some gold plated JST connectors somewhere and they would probably be better if one wants to use them.
Most Li-Poly packs come with the JST.
That may have been true in the past. I have found more retailers are giving a choice, especially with 3S LiPo's.

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12-21-2003 04:12 AM  13 years agoPost 9
Randall

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Oliver BC

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JST is industry standard
That is true, all the cheapest products come with them. LOL
Personaly I like how tightly Deans connectors fit together. Too tight for some people. In fact JST connectors have one possible advantage I can think of, if you ever have a bad crash it is more likely your battery will come loose and maybe save some of the electronics

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12-21-2003 04:16 AM  13 years agoPost 10
jeffs555

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North Carolina

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I have also had problems with JST connectors developing high resistance. I had JST connectors on my LiPo charger and my planes, and when I switched to deans for my HB, I made an adapter to go from JST on the charger to deans on my HB LiPo's. I noticed that when the charging light went out, I could wiggle the JST and get it to come on again, so I switched everything to deans. High resistance comes on gradually, so you rarely notice it. Switch to the deans, you won't be sorry.

Jeff

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12-21-2003 04:52 AM  13 years agoPost 11
rickc

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Creve Coeur IL. (Peoria Area)

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You guys are correct in saying the Deans are superior. I too agree. But to compare the differences in loss would take special equipment. I have a couple Li-Poly chargers, A Orbit Pro as well as a Triton. I never have had a charge issue with any Li-Poly packs, they have always reached proper voltage and capacity. If this was a 3D setup with a Hacker I would stand down, but for a stock motor setup if the JST is not defective then I still say you will not tell in difference in performance.

I use Deans in many applications, my Logo 10 12 and 14 cell 2400 packs are setup with Deans Ultra plugs. I use Deans 4 pin in my starter configuration. This is because both situations draw high amps.

If I had no connectors and needed decide on which to purchase then no doubt it would be Deans, but to think by changing all my packs and charge leads I would see a boost in performance if far fetched on a stock 370 motor. I guess the real diehards just hardwire and run no connectors.

Rick

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12-21-2003 04:46 PM  13 years agoPost 12
Randall

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Oliver BC

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Never stand down Rick
Actually I think you are correct that ULTRA Deans are over kill. It's the Micro Deans that I have and was referring to.
JST connectors work fine too if they are in good shape, but because they just don't fit as tight and make as good a connection as Deans and when they loosen up a bit more with age and or get a little oxidation on the contact points they do start to suffer performance problems.
So it's like you said, if you are in a position where you want to decide which connectors to go with, it makes sense to choose a better quality connector in the begining and stick with it.

I'll stand down now

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12-21-2003 06:19 PM  13 years agoPost 13
BeauGM

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Myrtle Beach, SC

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Hey guys, thanks alot for the advice. I assume that "JST" connectors are the ones that come stock on the hummingboard and birdseed batteries. If that is coorect, then I just checked my small parts organizer and found a bunch of those and some Micro Deans. Even though it may be an overkill, if I have both connectors readily available and want to solder a new connector on the Kokam only once.....EVER, then I'll probably go ahead and use the Micro Deans. It scares the hell out of me to cut the connector off the Kokam and solder a new one on. I think that I am capable (limited soldering experience) if I am very cautious. With all the talk of Li-polys catching fire and exploding, it scares me what could happen if one of the bares wires touches the other. So, last question, if going with the Deans then on the battery side does the positive or negative get soldered to the pin that is exposed on the other side of the connector? With regards to safety, does it matter?

-Geoff

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12-21-2003 09:51 PM  13 years agoPost 14
Gazoo

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Maryland

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The positive wire on the battery gets soldered to the pin that is exposed on the other side (male). The only thing to be careful about is to cut, strip, and solder one wire at a time or you risk shorting the battery. It is also a good idea to connect both of the connecters together. One of them will act as a heat sink and help keep the plastic from melting on the side you are soldering on. Hope you have extra connectors so you can do this on boths sides. If not, don't worry too much about it. It takes a lot of heat to melt the connector

I was a bit fearful of doing it, but after doing it once it became easy. Just make sure you solder the other side with the correct polarity. I messed up and almost destroyed a new PH25 because I had the polarity wrong.

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