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LiPo Tx Pack - 12/1/2012 8:32 PM   
Ed_Moorman



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Status: offline 		Has anyone used a LiPo transmitter pack like the Turnigy 2650, 3S, 1C tx pack in a JR 9303?

Any problems?

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RE: LiPo Tx Pack - 12/2/2012 3:25 AM   
countilaw



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Status: offline 		Ed,    It can be done, but to do it safely, you will need to add an in-line  voltage regulator to the battery.   The  11.1 volts coming from the  3s will over heat the  internal voltage regulator in the  Tx.   

Secondly,  you will need to charge the LiPo  externally of the  Tx case.   The on board  Tx charger will not charge the LiPo. 

Frank



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RE: LiPo Tx Pack - 12/6/2012 11:25 PM   
Flypaper 2



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Status: offline 		Used to have one in my old DX7. I put a diode from Radio Shack in the line to drop the votage a bit. No problems for many yrs. Was still in it when I sold it.

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RE: LiPo Tx Pack - 12/8/2012 4:31 AM   
countilaw



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Status: offline 		A diode will not  drop  voltage,    it will only prevent you from reversing the polarity.     A   resister   drops the voltage.   

A voltage regulator is needed.

Frank 



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RE: LiPo Tx Pack - 12/8/2012 6:19 AM   
Hossfly



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quote:

ORIGINAL: Ed_Moorman

Has anyone used a LiPo transmitter pack like the Turnigy 2650, 3S, 1C tx pack in a JR 9303?

Any problems?


Hello Ed!

How are you doing these days? Now you are far more versed in all this Lipo stuff than I will ever be or care to be. Yet, I would ask these questions:

1. Why LIPO when there are so many very good choices of STABLE batteries that have a lot less chances of blowing up in one's face?

2. Lithium Ion is far better than LiPo. Lith. Ion is far easier to work with. A Couple weeks ago I saw a guy bringing out two of the what are they called the rather new kids on the street, Li-fe or whatever. He was taking two out of an airplane a WHOOSH, smoke and fire for a couple seconds. I have seen several airplanes destroyed with LiPo packs. But then I do NOT do electrics, so don't really know much about that.

There is the A-123 whatever that is. In addition for a transmitter , it seems that the NiCads and NiMah are as good as one can get. I know how to handle them and there I stay, except for the Lith-Ion. I am using a number of them in airplanes. Charge one up, let it sit for a month, pick it up and go fly. I have several pulse chargers and the NiCads, NiMah are always ready to go. Charge 'em, set 'em on pulse and go fly when the call arises.

Good luck however you go. LiPo in a transmitter scares me. Kind of like early Lap-Tops use to be. Ya'll be careful out there.



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RE: LiPo Tx Pack - 12/8/2012 9:23 AM   
Flypaper 2



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Status: offline 		Read up on diodes and you'll find they'll drop the voltage by about .7 volts. and you do have to put them in the right way around. The diode is only for insurance. Many are being used without it. The guy that pulled the batt out of the plane obviously pulled on the wires and shorted it out. A nicad or nimh would do the same thing if you shorted it out. Many guys are using the A123/li-fe which are the same batt. They are 3.2 volts per cell as opposed to 3.7 for the lipo/li-ion, so don't need a regulator. My DX8 has a 4000 ma lipo but comes with a nimh. The trans has a built in charger that can be programmed to charge either one. And I do fly electric and stay at a Holiday Inn

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RE: LiPo Tx Pack - 12/8/2012 9:33 AM   
trax de max


 

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Status: offline 		lipos are still used in apple i pads and some are making the way back into lap tops. It's more rare now getting a lipo fire now than it was back in the day.

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RE: LiPo Tx Pack - 12/10/2012 11:57 AM   
OldRookie


 

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quote:

ORIGINAL: Flypaper 2

Many guys are using the A123/li-fe which are the same batt. They are 3.2 volts per cell as opposed to 3.7 for the lipo/li-ion, so don't need a regulator.


LiFe and A123 are the same chemistry, but that is where the similarity ends. The A123 is a much better battery.

Greg

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RE: LiPo Tx Pack - 12/10/2012 1:18 PM   
Flypaper 2



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Status: offline 		LI-FE is the chemistry, A123 is a brand name.

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RE: LiPo Tx Pack - 12/10/2012 2:35 PM   
OldRookie


 

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Status: offline 		You are correct that A123 is a brand name, but the A123 will also out preform a standard LiFe battery every time. That is why when the nano technology was developed at MIT, they got a patent on it.
On standard LiFe batteries, the molecules on the negative plate are all end to end. On the A123 all of the molecules stand up on end like a shag carpet giving the plate more surface area allowing these cells to charge faster, discharge faster, and the negative plate of the battery outlasts standard LiFE batteries, thus a longer life and more recharges.

Greg

< Message edited by OldRookie -- 12/10/2012 3:50 PM >

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RE: LiPo Tx Pack - 12/10/2012 3:25 PM   
BarracudaHockey



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quote:

ORIGINAL: OldRookie

You are correct that A123 is a brand name, but the A123 will also out preform a standard LiFe battery every time. That is why when this the nano technology was developed at MIT, they got a patent on it.
On standard LiFe batteries, the molecules on the negative plate are all end to end. On the A123 all of the molecules stand up on end like a shag carpet giving the plate more surface area allowing these cells to charge faster, discharge faster, and the negative plate of the battery outlasts standard LiFE batteries, thus a longer life and more recharges.

Greg

Correct!

quote:

A diode will not drop voltage, it will only prevent you from reversing the polarity. A resister drops the voltage.

A voltage regulator is needed.

Frank


Sorry thats not correct.

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RE: LiPo Tx Pack - 12/10/2012 3:40 PM   
Rodney



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Status: offline 		A diode will drop the voltage if current is flowing through it in the forward direction. How much? Depends on the type and manufacturing structure. Typically a silicon diode will drop about 0.7 volts across it but varies a bit with the amount of current being drawn. Of course it will present an almost complete blockage of current in the other direction until you exceed the breakdown voltage at which time it will either become a virtual short circuit or a completely open circuit.

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RE: LiPo Tx Pack - 12/10/2012 7:20 PM   
Bozarth


 

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quote:

ORIGINAL: Hossfly

1. Why LIPO when there are so many very good choices of STABLE batteries that have a lot less chances of blowing up in one's face?



When did this happen? I did not see it in the news! It sounds horrible - please tell us more!

Kurt


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