Q about RC 4.8v reciever

I had mentioned that I thought that LiPo cell technology is 3.7V/ea. (??) so I don't know where you would have obtained a 4.8V LiPo pack.. (??) Maybe I'm behind the times.. but I also thought that most standard receivers operated on 4.8V (1.2V NiCd/NiMh) cells x4.. or 6.0V alkaline (1.5V/ea.) cells x4. Some BEC equipped receivers used to be able to "step-down" the voltage of a 6/7 cell (7.2V/8.4V) NiCd or NiMh pack via an internal regulator. These receivers usually were furnished with a radio-system having an ESC.. and permitted operation of the receiver without the need of an additional battery-pack to power it.

A 2-cell (2S) LiPo pack would be 7.4V and "should" be safe to use with a BEC-equipped receiver.. or you could look for an in-line (external) step-down regulator to use with your receiver. Do NOT exceed the operating voltage of your receiver by any means. As with any rechargeable battery.. make sure that you properly cycle a LiPo pack.. especially if it's powering your receiver.

Read through this thread..

http://www.rcgroups.com/forums/showthread.php?t=1476446

Just in case you missed this link from above.. (currently out of stock though..  )

http://www.hobbyking.com/hobbyking/store/__6233__TURNIGY_8_15A_UBEC_for_Lipoly.html

I bought a 2S LiFe Rx pack (6.6V) and am concerned about using it without a regulator.. even though it's only .6V more than the 6.0 max-V rating of my Rx. It's a tiny pack.. 200mAh designed for very small models. It weighs only 15gr.

Here's an example of the weight of a flight-pack using this battery, a Tactic 6ch. Rx, and four "Electrifly" ES-50 nano-servos.

grams..



ounces..



add a Cox Babe Bee (I would use the Ace throttle with it)

grams..



ounces..



add a Sullivan #435 1oz. tank with fuel..

grams..



ounces..



That's a power-package with .049 engine, 4-ch. radio and 1 fl. oz. of fuel @ well under 1/2 a pound. It would be a great system for a little high-wing to fly in your field out back.

Ok My bad first off its a Conquest -4 chan. and the lipo battery is 4.8v 4 AAA ,, The other pack I cant use is A-AA at 1.2V each is again 4.8V. ** what I am getting is control surface Jitter at 100 yards with the smaller batt. The manual says 4.8V , 10ma. I have not checked the AA set witch is what I will do in a few and get back to ya"ll . Sorry for my stupidity , Eric

Eric,

Have you considered using a LiPo with a regulator for your flight pack. If you have a suitable 2S LiPo I could set you up with a regulator. Let me know if this could help.

Bob

The regulated LiPo is a great way to gain extra battery capacity and shed a little weight. However, I really like what Roddie does. I have converted my small glow fleet to LiFe Rx batteries and no regulators. The battery voltage drops to 6.0V as soon as it gets a load on it. It is a light, simple, dependable set up.

The switch between battery technology is messing with you.

NiCad 1.2V per cell
NiMH 1.2V per cell

4 cell is 4.8v

Alkeline is 1.5V per cell, 4 cell is 6V

If you have the space trying a 5-cell NiMH pack which would be 6V would be the way to go. Tape and common rechargeable batteries with some wire bits make a good test bed with low budget.

Phil