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Usage of JST Connectors??

Old 10-21-2009, 09:26 PM
  #1  
Swedish_Pilot
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Default Usage of JST Connectors??

Hi!
I wonder how many amps a JST Connector can stand?

I've got a JST wired ESC and I'm planning to connect larger batteries.

Would the connectors stand a 3S 2200mAh LiPo?

/S_P
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Old 10-21-2009, 09:37 PM
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Matt Kirsch
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7 Amps is about the practical limit.

The will withstand a 2200mAh LiPoly just fine as long as the Amp draw is not more than about 7 Amps.
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Old 10-21-2009, 11:42 PM
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slipstick
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The manufacturer rates them up to 2A. I'm willing to use them to about 5A but that's about all. I had a pair weld themselves together at around 7A .

But as Matt says it's the current that counts not the size of the battery it's coming out of .

Steve
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Old 10-21-2009, 11:46 PM
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smokejohnson
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I guess I have been lucky...I run them up to 10 amps.
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Old 10-22-2009, 12:52 PM
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Thanks!
In fact what I would like to do is to hook up a 3S 2200mAh LiPo to a Parkzone Spitfire.

The connector on the ESC side is some kind of Tamiya-look-a-like connector that Parkzone uses. I don't want to remove it as the NiMh battery supplied with the aircraft uses this type of connector, as well as the 12 V fast charger for NiMh batteries.

On the other hand it seems to be quite difficult to find spare contacts of that type, so my advanced LiPo charger won't be compatible with that type of contact.

Therefore my plan is to use the spare Parkazone battery connector that was supplies with the Spitfire and solder a female JST to the other end. Then I would solder a male JST contact to the LiPo battery so I can balance charge it normally.

Then it's just to hook the battery up to the Spitfire using the Parkzone/JST extension flex just created.

Do you think the JST contacts would stand such an application?

/S_P
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Old 10-22-2009, 12:52 PM
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whitecrest
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Originally Posted by smokejohnson View Post
I guess I have been lucky...I run them up to 10 amps.
+1. I have measured 10 amps going through them with no problems. Where I have them installed, maximum in-flight draw is about 4-5 amps. I try to mate them only during low or no-current conditions to avoid arcing and potential contact welding.
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Old 10-22-2009, 02:45 PM
  #7  
Matt Kirsch
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Doesn't the 3S 2200mAh battery have a separate tap for charging and balancing?

I would use 45A Anderson Powerpoles, or Dean's Ultra on a 3S 2200mAh battery and your adapter. Charge using the separate balance tap on the battery.
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Old 10-22-2009, 03:05 PM
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smokejohnson
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^^^^^^What Matt said ^^^^^^

A 480 is way too big for JST's.

Me personally I prefer APP's (Anderson Powerpoles).
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Old 10-23-2009, 12:01 AM
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Warden
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Originally Posted by whitecrest View Post
+1. I have measured 10 amps going through them with no problems. Where I have them installed, maximum in-flight draw is about 4-5 amps. I try to mate them only during low or no-current conditions to avoid arcing and potential contact welding.
+2 The other quote didn't come through but I run jst's at 10 amps all the time. Over 10 amps I go to APP's.
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Old 10-24-2009, 02:30 AM
  #10  
cyclops2
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With so many other plugs available, I only use them for receivers & 4 cell packs for a receiver.

The Copper wires get stiffer & stiffer. 1 day the plane crashes for no reason. Broken wire inside the insulation. Never saw it coming at you.
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Old 04-20-2011, 04:10 AM
  #11  
Radbuster
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Unhappy JST cause voltage drop??

I just switched from Tamiya connectors to JST (new NiMH's came with JSTs, and I like the smaller size, etc.). I have a brushed 380 motor on a glider. Flew with the new setup today and the ESC cut out at full throttle. OK at 7/8ths throttle, so launched that way. Thought it was the new battery, but the same thing happened with my old, tried and true 8.4V. Can the JST's be causing this? I haven't measured the voltage/current on the bench (need to wire that up.)
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Old 04-20-2011, 08:57 AM
  #12  
slipstick
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A brushed 380 shouldn't really be running much over 8-10A...but that's still pushing your luck with JST connectors.

And yes they do have fairly high resistance so can cause the ESC LVC to cut in, limiting the motor power.

Steve
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Old 04-21-2011, 12:51 AM
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Radbuster
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Steve;
Thanks for confirming my guess. I re-wired 3 batteries and ESC and made things worse! Ain't RC fun?!?
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