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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Reciever packs.
03-14-2010 12:42 AM  8 years agoPost 1
thenewguy

rrElite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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Right now on my Synergy I'm running a heavy Lithium Ion 5200 battery. I want to switch to something lighter. The 5200 is 6.6 oz.

The question is what are you running for a receiver pack? I have a Fromeco regulator, just for reference.

I want something lighter then what I have now.

Thanks Chris

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03-14-2010 01:16 AM  8 years agoPost 2
badbill

rrApprentice

Centerville, Georgia

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I really like the new Outrage NRG Lipo receiver packs. In my Vibe 50 I have a 3600, it is small, light and flying 7 flights puts it at just over 50% capacity remaining.

Bill Davenport
AMA 28141

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03-14-2010 01:22 AM  8 years agoPost 3
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Do you know what it weights. I'll go look at it now.

Thanks Chris

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03-14-2010 01:29 AM  8 years agoPost 4
badbill

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Centerville, Georgia

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03-14-2010 01:36 AM  8 years agoPost 5
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Thanks for the heads up Bill.

Chris

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03-14-2010 07:03 AM  8 years agoPost 6
thenewguy

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Corvallis, Oregon Where there is liquid sunshine!

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Anyone else?

Thanks Chris

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03-14-2010 03:54 PM  8 years agoPost 7
Ace Dude

rrProfessor

USA

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I recently purchased a Hyperion LiFePO4 RX pack for one of my planks and considering getting more for my helis. However, I'm not sure these will have the weight reduction you're looking for.

For high capacity and light weight LiPo may be your best option at the moment. In that case I'd look at the Hyperion VX LiPo packs, some of which can be charged at 5C.

http://media.hyperion.hk/dn/fg3radio/

  

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03-14-2010 04:01 PM  8 years agoPost 8
hootowl

rrProfessor

Garnet Valley, Pa.

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I run A123 2Cell's that come in at 5.5 OZ. Not really light but there are some things that I will sacrifice a little weight for if it adds a high degree of reliability.

Wolves don't lose sleep over the opinions of sheep

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03-14-2010 04:28 PM  8 years agoPost 9
Zaneman007

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Texas - USA

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On the LiFe packs, how are you checking the capacity on those?

Old Guys Rule!

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03-14-2010 04:35 PM  8 years agoPost 10
badbill

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Centerville, Georgia

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With life packs, you have to fly them for a few minutes, recharge and then figure usage by minute. Then time your flights to not use all of capacity- a good plan is to time flights to use 50% capacity and then recharge. The dropoff at the end is very sharp, you don't dare try to do it by checking voltage.

Bill Davenport
AMA 28141

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03-14-2010 05:06 PM  8 years agoPost 11
Ace Dude

rrProfessor

USA

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Note A123 are LiFePO4 technology. The same safe fly checking technique applies to LiPo as well.

It's probably best to do a flight, change and see how many mAh go back into the pack. Do two flights, repeat. Do three flights (capacity permitting) repeat and determine your average mAh used per flight. Then determine the max number of flights per pack while maintaining a 50% safety margin as previously recommended.

  

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03-15-2010 03:46 AM  8 years agoPost 12
Ken Filloon

rrVeteran

Highland, Michigan

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Is it just me! It seems for most people to recharge a receiver pack at the field is like getting a tooth pulled. I normally take 2 Helicopters with me when I go flying.
I will put 3 flights on each one, if I want to fly more than 6 flights that day, I just CHARGE the battery. I have never put more than a 1900 mah lipo on any Helicopter, even my 90 size birds. I know in this hobby everyone has their own ideas on how to set up a helicopter but, it seems so many strap a 5200 mah brick to the front of the Heli just to avoid charging it at the field. I don’t get it.

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03-15-2010 03:51 AM  8 years agoPost 13
hootowl

rrProfessor

Garnet Valley, Pa.

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That's the beauty of the A123's. You can charge them in minutes.

Wolves don't lose sleep over the opinions of sheep

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03-15-2010 04:31 AM  8 years agoPost 14
Ace Dude

rrProfessor

USA

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I'm using a 2S 2100 LiPo in my heli at the moment and comfortably get 4 flights on it. Its max charge rate is 2C.

They Hyperions I mentioned are capable of being charged at 4C. The A123 are good for 4C and there are folks charging them at much higher rates.

I love the A123s, but will probably be using the Hypersions only because the shape makes them much easier to mount in the heli.

  

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03-15-2010 04:34 AM  8 years agoPost 15
ACKopter

rrApprentice

Florida

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I dont so much mind charging at the field but my Li Ion packs are recommended for a 1 AMP charge rate, it takes forever to charge. I was considering a second pack so I could change them out if I wanted more flights that day.

I thought the Li Ion packs were lighter than Lipoly.

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03-15-2010 04:52 AM  8 years agoPost 16
johnbs8

rrKey Veteran

roseville michigan

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i too am looking for an alternate rx pack to power my raptor. i was currently using a duralite LiIo 4200 but it has taken a crap on me. so now im looking at A123. i like the safety feature of these batteries along with 4C charge rate. i read something about not needing a regulator? i run my system now with the duralite 5.3v regulator. also wandering on average how many flights i should get on an A123/LiFe 2200 mah batt. been looking at the Hyperion G3 LiFePo4 rx pack 2200 mah. the price is pretty good and id probably buy 2.

TT X50 Nitro
Warp 360
Logo 550sx
TeaM KicKnWinG

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03-15-2010 07:50 AM  8 years agoPost 17
Terrabit

rrElite Veteran

Seattle, WA - USA

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I use two 2s Hyperion LiFe 2100's in my vbar T700. At 103g they have worked very well for me. I get 3 flights on each of them and they charge quickly.

I would be sure that you have some flexibility in terms of mounting before you make that big of a change. You will undoubtedly have to move something to get your cg right.

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03-15-2010 04:05 PM  8 years agoPost 18
Ace Dude

rrProfessor

USA

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I use two 2s Hyperion LiFe 2100's in my vbar T700. At 103g they have worked very well for me. I get 3 flights on each of them and they charge quickly.
I'd be curious to know how much mAh goes back in when you recharge after 3 flights?

  

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03-15-2010 04:35 PM  8 years agoPost 19
Terrabit

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Seattle, WA - USA

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Just about 1,500.

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03-15-2010 04:52 PM  8 years agoPost 20
red_z06

rrProfessor

Dumont, NJ

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I thought the Li Ion packs were lighter than Lipoly.
LiIon packs have highest energy density among packs. That means they are the lightest per mah. However, this comes with a penalty of very low 2-3c discharge rate. They are suited perfect for receiver packs due to low amp (less than 15amps). Any low discharge (high internal impedance) packs like LiIon or NiMH will have to be charged at sub 1c range (typically 1/2c)

Pro: Lighest
Con: low discharge/charge rate (does not matter for receiver pack use)

A123 or LiFe can be used with a meter but they drop very little from 6.6v to 6.4v. However, this requires very good contact connectors to minimize voltage drop across the contacts and long wires. If you use the same equipment, you can chart your pack capacity to voltage and come up with your own capacity meter graph to use with your volt meter (zero load).

Pro: almost regulator like output, simpler wiring
con: almost regulator like output, no HV use

They stay very constant at 6.6v range so it is much like a 5cell nicad fully charged. You can consider it as a Lipo on 6.6v regulator. For HV users, A123 will not provide enough voltage so you will have to resort to 2s lipo.

www.JustinJee.com

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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Reciever packs.
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