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Using Lipos in Transmitter.

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Old 12-22-2004, 04:42 AM
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obolel
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Default Using Lipos in Transmitter.

When I charge my JR 8103 to fullest, I get a voltage reading of 11.8 volts. Since the cells are 600 maH Nicds, I can barely fly all day, generally I have to recharge again. I believe a three cell Lipo pack can be retrofitted to the battery compartment, which will have less weight and have a considerably longer running time.

At full charge ( @ 4.2 volts per cell ) lipo cells give about 4.1 volts per cell under load, bringing total voltage to 12.3 volts.

Does anyone have an idea whether JR radio can handle this ? I think it can, seems like a small difference to me, but I would be interested to know if anyone actually tried this.

Also I think JR begins to alarm when the voltage drops below 9.0 volts, so I think it is also safe for Lipos.


Any thoughts ?

Thanks in advance.
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Old 12-22-2004, 06:09 AM
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Default RE: Using Lipos in Transmitter.

I just bought 2500 mAh AA NiMH batteries. It seems this would be an easy upgrade.
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Old 12-22-2004, 06:54 AM
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Default RE: Using Lipos in Transmitter.

Yeah, seems so. But I have a 1500 3 cell lipo looking or a job, that's why I am asking.

Thanks.
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Old 12-23-2004, 03:29 AM
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Default RE: Using Lipos in Transmitter.

That 11.8 volts is peek voltage off a fully charged nimh pack. I would NOT plug a raw lipo pack into a transmitter like that there's a very good chance you'll fry it. Considering TX's are constant current devices in general a linear regulator would be a good sollution to using a lipo pack. Using a 10 volt regulator on a three cell lipo pack should work though, only wasting a little bit of power. If you don't want to waste power, it's simple, upgrade to higher capacity nimhs.
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Old 12-23-2004, 05:51 AM
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Default RE: Using Lipos in Transmitter.

I second opinions. Find an airplane for the 3c. Buy Nimh for transmitter.

Andy
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Old 12-23-2004, 02:40 PM
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Default RE: Using Lipos in Transmitter.

As a side note the new futaba 14MZ is going to be Li ION powered.......
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Old 12-23-2004, 02:47 PM
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Default RE: Using Lipos in Transmitter.

I thought the 14MZ is using the 2200 Li ION, not polymer?
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Old 12-24-2004, 03:18 AM
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Default RE: Using Lipos in Transmitter.

Li ion / li poly are the same batteries. Li-ion is just what they usually call metal packed cells (coin cells) Li-poly's are different because the materials that make up the cell are polymerized, IE plastic, no metal casing (though they are packed in foil). so they can be formed into any shape or charactoristic just by molding it differently. The 14mz is obviously; Because of it's size and shape a li-poly pack.
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