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TX li-po for Futaba 8FG

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Old 01-23-2011, 06:53 PM
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Herbs_007
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Default TX li-po for Futaba 8FG

Does anyone know if there is a transmitter li-po battery to fit the Futaba 8FG that doesnt require a ubec, the tx battery is this model is only 7.2volts.
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Old 01-23-2011, 07:52 PM
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Default RE: TX li-po for Futaba 8FG

Any 2s lipo that will fit will work. The hyperion 2600 2s lipo will work. There is a 2800mah lipo that somes stock with the 8fg overseas. (european market)

Take a few measurments of the battery compartment and buy whatever 2s lipo that will fit. The radio will work just fine as a 2s lipo is around the same voltage. I run lipos in all my futaba TXs. same will hold true in my 8fg next week
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Old 01-24-2011, 12:56 PM
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Default RE: TX li-po for Futaba 8FG

Thanks, muchly appreciated...
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Old 01-24-2011, 03:28 PM
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Default RE: TX li-po for Futaba 8FG

I have been using 2cell LiPos in my JR XP8103, XP9303, Futaba 8AUPS and 9CAP, for several years. I do not have the 8FG so I do not know if they encourage the use of LiPos, but I have seen numerous posts where those who were afraid of the higher voltage, used A123 cells, Enneloop cells, or they used Diodes in the Battery Wires from the Tx to the battery. These particular Diodes drop the voltage about .3v for every one installed. There are several threads to this effect with Radio Shack part numbers.
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Old 01-24-2011, 03:31 PM
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Default RE: TX li-po for Futaba 8FG

Rich - you sure you're not using 3S lipos in your 8103, 9303, etc? 2S is only 7.4V nominal, 8.4 fully charged. 3S would be 11.1 nominal, 12.6 fully charged.

I think a lot of the newer radios coming out are using lower TX voltage - 7.2V NiMh or NiCd batteries, or 7.4V LiPo.

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Old 01-24-2011, 03:43 PM
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Default RE: TX li-po for Futaba 8FG

I apologize!! Thank you for correcting me. Yes, 3cell LiPos at 3.7v/cell, nominal, and 4.2v/cell fully charged (12.4v). I believe the A123's are 3.3v/cell or 9.9v for 3cell. The Eneloop cells are an advancement in NiMh technology and have the standard 8cells at 1.2v/cell. They hold their charge much longer than NiCad and NiMh and closer to what LiPos do. They are of course heavier.
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Old 01-24-2011, 03:59 PM
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Default RE: TX li-po for Futaba 8FG

I've been considering a 3S A123 (LiFePo4) type battery for my 9303.

If I had a new 8FG or something that ran on 7.2V, I'd probably think real hard about LiPo 2S for it, mostly for the low self-discharge aspect. The Eneloops are pretty good from that point of view, but still not as good as what I've seen on LiPo packs I have around for RX packs and electric flight packs.

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Old 01-24-2011, 04:12 PM
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Default RE: TX li-po for Futaba 8FG

Fizz - I forgot about the fact that the newer Tx's are lower voltage. Does that mean that the 8FG is compatible with 2cell LiPos?
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Old 01-24-2011, 04:32 PM
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Default RE: TX li-po for Futaba 8FG

I'm not a Futaba user, but with a 7.2V nominal NiMh battery, I would think it's not too much of a stretch to see using a 7.4V LiPo pack.

I believe the Hitec Aurora 9 comes with NiMh 7.2V, but they do say you can use a LiPo in it -

From their (HItec's) FAQ on the website:

A. Yes, 2S LiPo’s are compatible with the Aurora. You will need to go into the SYS MGMT (page2/2)and go to the battery icon to select LiPo and a cut off voltage to prevent the battery from being damaged if the radio is accidentally left powered on.

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Old 01-24-2011, 04:40 PM
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Default RE: TX li-po for Futaba 8FG

Thanks!!
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Old 01-24-2011, 04:55 PM
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Default RE: TX li-po for Futaba 8FG

Check out this site, these LiFe Tx batteries seem to be the answer for powering Txs, they are even charged using your existing Tx charger through the Tx charge port. Delivery is FAST too, my battery took only 4 days to get to NZ!! Don't forget to order the adaport plug along with the battery. (@ the bottom of the list of batteries only a couple of $s)

http://aircraft-world.com/shopdispla...tery+-+LiFePO4

Cheers

David
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Old 01-24-2011, 05:10 PM
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Default RE: TX li-po for Futaba 8FG

This option would certainly save some money and keep the charging simple, however, the charge rate would be quite slow. Most Wall Chargers put out 100-150ma. For a 2500mah Tx battery, that would take some time. You would also not have a handle on the voltage of the individual cells. If the internal circuitry tries to Balance the cells that might be of some help and hopefully it would provide a Reverse Polarity warning)

I like to use an FMA CellPro 4S Multi or the 10S. Even at a 1C charge rate (2.5a for a 2500mah A123 or LiPo) you are only looking at an hour or so to charge.
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Old 01-24-2011, 06:07 PM
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Default RE: TX li-po for Futaba 8FG

I have ordered hyperion batterys from www.rclipos.com and had good luck - same prices as what I was seeing on the Japanese site, and they were shipped from California.

If I remember correctly, the shipping was free and fairly quick!
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Old 01-24-2011, 06:25 PM
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Default RE: TX li-po for Futaba 8FG

Have you looked at the prices of Turningy, Lightpower, and Zippy, from Hobby King. Many from my RC club have used them with great success. When I was at EJets, in Grove City, Oh, this summer, I saw the EP Buddy booth. I purchased some LiFe Rx packs at a very reasonable price. I would think they might have Tx packs, as well. They were also at the NEAT Fair, this fall.
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Old 01-24-2011, 06:47 PM
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Default RE: TX li-po for Futaba 8FG

I have used LiPo's from HK, but the hyperion LiFePo4's I bought from rclipos.

So far good luck with both!
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Old 01-24-2011, 06:48 PM
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Default RE: TX li-po for Futaba 8FG

Thanks!! I will give them a look!!
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