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HomeRC & PowerAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Sanyo or kodak eneloop 4.8 AA.
01-28-2012 02:17 AM  6 years agoPost 1
jake21

rrApprentice

ontario canada

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Any one using 4.8 sanyo or Kodak eneloop aa for reciever packs.I dont want the weight of sub c and dont want to use a step down or regulator.
All my servos are futaba 9252. Raptor 50 401 gyro.AR7000.
Thanks in advance.

The only way to not crash is up

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01-28-2012 03:13 AM  6 years agoPost 2
Justin Stuart (RIP)

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Plano, Texas

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Go to "cheapbatterypacks.com" and get yourself some 1/2 or 1/3A packs made. They are about the same weight as a pack of AA batteries.

Eneloops have too high an internal resistance and can cause your RX to brown out if you jiggle the servos too fast. They are not good for an RX pack.

For an RX pack, you want very low internal resistance.

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01-28-2012 03:40 PM  6 years agoPost 3
cdrking

rrElite Veteran

Seattle

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I have used Eneloop cells in my DX7 for two seasons now and have had no issues what so ever. Excellent cells and you don't have to charge after sitting for a few weeks.

I would not use them for a RX pack though. There are too many good options out there today. 2S lipo, Li-Ion, LiFe, etc.

Jeff

To hover is divine, the alternative is rather PLANE.

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01-28-2012 04:53 PM  6 years agoPost 4
z11355

rrMaster

New England

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ditto. Eneloop is fine for TX packs, no go for RX. Been using 2 packs in my (gasp) 9Z for a few seasons and they're great.

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01-28-2012 04:57 PM  6 years agoPost 5
VKGT

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Sanford, NC

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Is there any documentation out there about not using eneloops for RX packs? Are they just bad for helis/planes and okay for cars or boats since they use less servos or just bad for RX all around?

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01-28-2012 05:07 PM  6 years agoPost 6
rexxigpilot

rrProfessor

Florida

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The best battery type for RX is LiFe or A123. Even with 9252 servos you won't need a regulator. I'm sure someone will post that the 9252 is only rated for 4.8V, but Futaba means a 4 cell NiCd pack which can be up to 5.7V fully charged. A 2S LiFe or A123 pack will be between 6.4V to 6.8V for its usefull discharge. The 9252 can handle this with ease. Hundreds of pilots including me have been doing it for years without a high failure rate. In fact, I've never had a 9252 go bad yet and some of mine are 8 years old.

Eneloop are no good for anything needing high current like servos in a heli. They are great for TX.

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01-28-2012 07:13 PM  6 years agoPost 7
jake21

rrApprentice

ontario canada

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Hey Rex.
Would I need to step down for 401 gyro with 9254 if using 2 cell Life in your experience?

The only way to not crash is up

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01-29-2012 12:28 AM  6 years agoPost 8
Phaedrus

rrKey Veteran

S. Orange County, California

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I would say yes. Here is what Futaba has to say about the 9254:
Power Supply: 4.8V (Futaba does NOT recommend using 6V)
The issue with the Eneloop cells for RX power is that they have a very high internal impedance (> 20 milli-ohms per cell) and under any reasonable load they will drop voltage a substantial amount, like a volt or more. Under as little as 500 mA load they will drop a full 0.5 volts compared to a LiFePO4 pack.

Hope that helps.

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01-29-2012 01:01 AM  6 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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Your 9254 won't do well if run on more than 5.8 volts.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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01-29-2012 07:27 AM  6 years agoPost 10
rexxigpilot

rrProfessor

Florida

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Your 9254 won't do well if run on more than 5.8 volts.
I agree. Eventhough the 9252 holds up well and is a 4.8V rated servo the 9254 does not. Now if you had a 9256 or BLS 251 tail servo (both 760µs center PW servos) I would say go for it, but not the 9254.

I'm sure the 401 would be fine on unregulated LiFe. Just use a step down to the 9254. A diode only steps down 0.7V, so the 9254 will still be running at 5.7 to 6.1V. You should expect a slightly reduced life from the 9254 but with better/faster performance.

If you burn it up, PM me. I have a few NIB 9254's sitting around. They will still work great on throttle using unregulated LiFe. There is not much load, so they don't overheat in throttle use.

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01-29-2012 01:57 PM  6 years agoPost 11
jake21

rrApprentice

ontario canada

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Thanks everyone.
I have been running this setup for a while now but wanted to reduce the weight of the sub c. If I want to lighten the load I guess I will need a regulator to be safe.
Thanks.

The only way to not crash is up

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01-29-2012 02:09 PM  6 years agoPost 12
Ace Dude

rrProfessor

USA

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I would not recommend using Eneloop in an RX application for the reasons already stated. Do a search hear and you'll find some bad experiences with users using them.

There are very few places I trust to assemble quality RX packs. Take a look a hangtimes.com. They have lots of NiXx cell/pack options available and some very good technical information on their website. They list the internal resistance (IR) of each of the cells they use.

Note, I'm not affiliated with them, just a happy customer. I'm using LiFe batteries for almost all my RX applications these days, but did purchase a NiXx buffer pack from them for my Jive ESC a short time ago.

  

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01-29-2012 03:14 PM  6 years agoPost 13
jake21

rrApprentice

ontario canada

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Hey Ace.
If you are using 4.8 servos what regulator are you using?
Jake.

The only way to not crash is up

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01-29-2012 03:58 PM  6 years agoPost 14
Ace Dude

rrProfessor

USA

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With my LiFe packs and 4.8v servos I'm using the Fromeco Arizona regulator. The Arizona is a really well designed regulator.

  

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01-31-2012 03:59 PM  6 years agoPost 15
jake21

rrApprentice

ontario canada

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Finished it up last night and needed the sub c for ballast to get the c of g correct anyways.I never had an issue with this set up but was hoping I could go lighter.
Thanks Jake.

The only way to not crash is up

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