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06-27-2014 04:33 PM  3 years agoPost 1
Bladebuster

rrApprentice

Bayside N.Y.

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What type of batteries (lipo,nimh,life,etc} do most of you use in your gassers.

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06-27-2014 04:41 PM  3 years agoPost 2
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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Depends more on the servos.

New HV servos can use any battery, but they are designed for LiFe and LiPo. 6V max servos are not recommended on LiPo's. Older servos would be best with NiMh.

I use LiFe and LiPo in the 2000+ mah range with HV servos. Using 300 mah per flight allows for 4 -5 flight before recharging.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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06-29-2014 04:50 PM  3 years agoPost 3
jharkin

rrApprentice

Holliston, MA - USA

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LiFePO4
I use LiFe extensively in everything - helis and airplanes. So far Ive used only genuine A123s (1100s and 2300s).

In my mind LiFe is the ultimate RX power - its compatible with almost anything just like a NiMH without the maintenance and slow charging; yet has the power delivery of a lipo with no of the storage and cold weather hassles. The tradeoff is cost and a little extra weight.

* They are a drop in replacement for a 5 cell NiCD/NiMH with very similar voltages, so almost any servo rated as a "6 volt" servo can handle one.

* You can charge them at very high rates. A123s can take up to 5C without damage. So no charging the night beofre needed. Charge at the field and then do a 5 minute top off evey So run 2 or 3 flights.

* They tolerate being stored at any charge level. So no worries about storage charging.

* They can take very high discharge rates with minimal voltage sag. The genuine A123s are rated for 30C cont/60 burst - far more than you are ever likely to see as an RX pack.

* Cold weather isn't much of an issue. Ive flow with them down to 20F and left them in my unheated New England garage all winter.

The one point of caution is that you cannot measure capacity left with an ESV and when they do get low they can drop voltage with little warning.. so you have to be conservative, monitor charge returned after flight and learn how many flights to go before rechargning.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

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06-29-2014 06:05 PM  3 years agoPost 4
rhodesengr

rrApprentice

Pleasanton, CA USA

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+1
I have been using this one
http://www3.towerhobbies.com/cgi-bi...?&I=LXDVCC&P=ML
I like all the connector options. I change out the main power connector for EC3 only because that is what I have been using.

Like jharkin said, you have to understand the voltage discharge curve is different that Lipo. Lipo voltage drops more or less linearly as you draw current. LiFe charges to 7.2 but drops to 6.8 or so almost immediately. The it stays around that level until your are about to run out and then it drops fast. The only way to gauge usage is by charge back mAh. I also use about 300mAh per flight and I don't like to press my luck so I re-charge after 2-3 flights. A guy at my field thought is LiFe battery was bad because his LiPo checker said it was at 50% no matter how long he charged it. The battery was fine.

Seems most 6V rated servos do fine at the slightly higher LiFe voltage and of course the HV rated ones are fine.

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06-29-2014 06:13 PM  3 years agoPost 5
Pascal-KC

rrKey Veteran

Kansas City, KS, USA

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+1 on LiFe as a great receiver battery for gassers and also electric helis.

Team Mikado, Team Revolectrix, KBDD Team Pilot

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