transmitter lipos - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-03-2007, 07:53 AM   #11
Max Continuous
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I use a Dualsky 2500 mah 3S lipo in my JR7202. It is designed specifically for transmitters and is equipped with its' own built in cell balancer. I got it at 2dog RC.

It is slightly smaller than the original NIMH battery and fits perfectly into the battery bay. In the past, I would come home and have a great window of opportunity to go flying only to find that my transmitter pack needed to be charged from sitting around. If I spent an entire day flying, I would have to re charge at some point.

The LIPO has changed all that. I can now charge my transmitter and know that I will have ample power to go flying for 2 or more full days even if it has been sitting on the shelf for awhile.

The JR has a voltage display so I can monitor voltage and recharge before it gets too low. So far, I have nothing but good things to say about the conversion.
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Old 06-07-2007, 07:48 PM   #12
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Fly all day and only see the voltage drop from 12.6 to 11.3. Not a bad deal eh? Fatal dischare is below 9V in my Lipo's. Are you still flying your $2000 airplane on 9V of transmitter power?
Using the standard computation of VxA=W we see that fully charged 2800MAh nicads gives the following watts of TX power. 11V x 2.8A would equal 30 Watts or so. As the capacity (Mah in your pack drops from 2.8A fully charged to 1.4A and the voltage drops from 11 to 10 for instance you now have less than 15 Watts of TX power. This means your effective range for your TX/RX has droped in half!
I have seen my motor glider decide to motor off into the sunset because I pushed it, flying my NiMh pac down to 10V. Think about it. My Futaba 8 channel seems to be a power hog to boot. Since I have been flying Lipo's I never, after a full day of flying have seen my TX voltage drop below 11V. the place most folks with old fashioned batterys start flying! True enough that my capacity (MAh's) have dropped and therefore my watts as well, I am still putting out more watts than any Nicad or NiMh pack is at the end of the day.
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