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Old Aug 07, 2014, 02:14 AM
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bogdan.motrici's Avatar
Romania, Bucharest
Joined Jan 2014
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UBEC or LiFe Battery, what is the best solution?

Hi guys,
I'm net in the glow engine topic, still flying electric as well and will most probably continue with both but I like a lot nitro planes as well. I am an owner of WOT Mk2 1.3m wingspan with 8.5CC engine and I have a question which is in my mind as it happened to many people. To power your receiver and servos what do you think is the best option? Many people complained about SBEC/UBEC that are heating up and could stop and your plane will crash and they give as an option to use directly a LiFe battery but this means clearly that your servos will have to be above 6V so in the end HV. I use and SBEC 5-6V 3A and now switched to a new one 8A 5-6V as the previous one was second hand, did not tested yet in the flying this new one, just on the ground an I am lets say scared about a possible heating up from the SBEC and thinking to sell the standard servos that I have now and buy HV and use LiFe battery. What you are using now? Did you had issues with SBEC/UBEC? I am having an HiModel one.
Thx in advance for your feedback.
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Old Aug 07, 2014, 06:44 AM
WCB
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NC
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You don't need HV rated servos or a voltage regulator to run LIFE batteries. Any servo rated for 6 volts will be ok. I have been running unregulated LIFE packs with standard servos for years with no problem. If you plan on using a 7.4 volt LIPO battery then use the HV servos.
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Old Aug 07, 2014, 08:37 AM
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bogdan.motrici's Avatar
Romania, Bucharest
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Thx WCB for your feedback, but I still have a concern, my S3003 Futaba are between 4.8-6V, a fully charged 2S LiFe battery is 7.2 V, right? So this 1.2 V on top of 6V that servo support really does not affect? Sorry for being paranoiac but I am running glow engine model as well and do not want to have a crash with it.
Cheers,
Bogdan
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Old Aug 07, 2014, 10:52 AM
Hutch
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United States, Mt, Bozeman
Joined Jan 2012
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+1 Life, those 3003s handle it without trouble. A life pack jumps down to 6.6V once you put any load on it (or pull it off the charger), so no need to worry about the 7.2V. About the same voltage as a "6V" batt anyways.
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Old Aug 07, 2014, 11:32 AM
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United States, MO, Warrensburg
Joined Jul 2013
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Here's a post from another forum that I thought did a pretty good job of explaining the differences between NiMH/NiCad and LiFE batteries, in terms of voltages and needs for a regulator.

Voltage Regulator for LiFE Rx Battery?

I think the bottom line is if your receiver and servos are rated for 6V, you should be okay with a LiFE. I started flying with a LiFE on Futaba s3003's without a regulator a few months ago and haven't had any issues yet.
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Old Aug 08, 2014, 12:15 AM
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United States, GA, Loganville
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A 5 cell NiMH charges up to 7.2 v just like a LiFE battery.
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Old Aug 08, 2014, 10:42 PM
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United States, WA, Port Angeles
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as said, I hafta agree, trust your Futaba's! they handle a 5 cell nihm and life batts with ease!

been doing it for years! pumping 7 volts through all my Futaba servo's and receiver's!

I lost a 55cc plane due too what I think was a castle 10amp regulator failure!

keep it simple!
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Old Aug 16, 2014, 08:16 AM
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United States, IA, Rockwell
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At present I don't use either, With that said, when my Nixxx packs begin to fail they will be replaced with LiFe packs WITHOUT a regulator. Leaving out the regulator is one less thing to fail, not to mention two less connections in the system.

Ken
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Old Aug 18, 2014, 12:25 PM
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Wichita, Kansas
Joined Dec 2005
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There's no problem with LiFe direct into a receiver. I fly LiFe on all my glow planes and glider but two (due to battery space constraints and there were flying before I started converting to LiFe). I fly Airtronics, Spektrum and Futaba on 2.4GHz, and Futaba & JR on 72MHz. I've never had an issue with a LiFe, and have never run a regulator with a LiFe - it's now my battery of choice for receiver packs.

Hogflyer
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Old Aug 19, 2014, 04:32 AM
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Would there be a problem in using an unregulated 2S lipo as a Rx pack?

I know that my Rx is fine, up to 9V.

What about the servos?
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Old Aug 19, 2014, 07:49 AM
WCB
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Quote:
Originally Posted by bogbeagle View Post
Would there be a problem in using an unregulated 2S lipo as a Rx pack?

I know that my Rx is fine, up to 9V.

What about the servos?
You'll need a regulator or you'll need to use high voltage servos.
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Old Aug 19, 2014, 08:51 AM
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Thanks. I bought a ubec for that reason ... haven't used the system in anger, yet.

I was just hoping that it might be redundant ... well, it could be, if I buy some LiFe batteries.
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Old Aug 20, 2014, 09:19 AM
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United States, CA, Winchester
Joined Nov 2011
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Quote:
Originally Posted by whiskykid View Post
as said, I hafta agree, trust your Futaba's! they handle a 5 cell nihm and life batts with ease!

been doing it for years! pumping 7 volts through all my Futaba servo's and receiver's!

I lost a 55cc plane due too what I think was a castle 10amp regulator failure!

keep it simple!

I had a Castle reducer quit working on me also. Luckily it was only used on an ignition system and I saved the plane. No more reducers for me = one less thing to bring my plane down.
I have used life batteries with Futaba 3003 and 3305 okay, but I feel the best solution is to keep it simple. Use a matched power supply and servo for best results....
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Old Sep 07, 2014, 06:04 AM
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Tucson
Joined Nov 2009
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I can't use Life batteries to run my electric planes (22 volts, 110 amps). I have all sorts of LiPo batteries all over the place. Why would I go out and buy another kind of battery and complicate things?

If you don't fly electrics, and only use batteries for the RX and servos, then not using an SBEC may make sense.
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Old Sep 07, 2014, 08:54 AM
WCB
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NC
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Quote:
Originally Posted by wuest3141 View Post
I can't use Life batteries to run my electric planes (22 volts, 110 amps). I have all sorts of LiPo batteries all over the place. Why would I go out and buy another kind of battery and complicate things?

If you don't fly electrics, and only use batteries for the RX and servos, then not using an SBEC may make sense.
Having two different kinds of batteries is complicated? Really?
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