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Old Feb 20, 2012, 04:36 AM
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Canada, MB, Oakbank
Joined Dec 2004
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1/2A Rx Battery Pack

Hi there. I was just wondering what you use for a battery pack in your 1/2A models. I have a 4AA battery holder, but was thinking of something lighter. So I was wondering if I could solder together 2-4 AAA NiMh rechargeable batteries for a pack. The ones are Sunbeam 800 mAh AAA NiMh rechargeables. Would 2 be alright for 2 - 3 flights of around 5 minutes? I only fly at the cottage and I have all my Triton Jr to charge with. Thanks.
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Old Feb 20, 2012, 07:57 AM
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Gulfport/Biloxi Biloxi Reg, Mississippi, United States
Joined Dec 2000
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New

While I don't have experience with Sunbeam batteries, they should be more than adequate for 15 minutes of flight. If you are uncomfortable with soldering, try Radical R/C as they have a great selection of batteries plus tips on batteries. Good luck!
Frank
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Old Feb 20, 2012, 07:59 AM
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NSW, Australia
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You could easily run AAA packs - I've done so on a 2ch glider with great success.

Personally though, my 1/2A reciever pack of choice is a 2-cell 500mAh lithium polymer battery. Cheap, light, compact and very fast recharge times should you get caught out at the field.

CHeers - boingk
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Old Feb 20, 2012, 08:25 AM
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Ok. Forgot to add. How does one run a small LiPo battery as a Rx pack? I have not yet fully decided if I am going 72, or 2.4 in this one, just in case it makes a difference. I have a nice new 2s 360 mAh sitting here for a project that got abandoned.
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Old Feb 20, 2012, 08:26 AM
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Birmingham, Alabama
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how many channels? what size servos? what size plane? how long do you want to fly?
i mean 20 years ago if you were flying a competition glider with an 049/051 motor pod youd use a super small 4s 200ma nicd pack, put a surface charge on it & hopefully fly one long flight. normal would be about 400-450ma for nicd/nimh for a few flights a day.
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Old Feb 20, 2012, 10:19 AM
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Western KY
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Quote:
Originally Posted by NEW222 View Post
Ok. Forgot to add. How does one run a small LiPo battery as a Rx pack? .......... I have a nice new 2s 360 mAh sitting here for a project that got abandoned.
Use a battery eliminator circuit -- it's a voltage regulator to drop your Lipo voltage to 5v. If you're going to use your Triton Jr to charge Lipo's, you should pick up a balancer. I use a Equinox with my Triton and have been pleased with the performance.

battery eliminator
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Old Feb 20, 2012, 11:18 AM
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Canada
Joined Nov 2000
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Good idea. the bec on a lipo. ;- )
As a suggestion if you are only using lipos for rx flight packs then a simple $10 lipo charger will work well. These are balancing chargers of far above their price point quality.
Long ago got one with my arf heli (it is orange though) curiously it has proven to be my fave charger.. yes! the darn thing is old fool proof and it works.. v well. apparently durable too.
This seems to be the hk version;
http://www.hobbyking.com/hobbyking/s...ger_2S_3S.html

Fit this battery :http://www.hobbyking.com/hobbyking/s...poly_Pack.html
and for less than $10 you can fly your 1/2A all day.
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Old Feb 20, 2012, 11:46 AM
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Canada, MB, Oakbank
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Quote:
Originally Posted by Toysrme View Post
how many channels? what size servos? what size plane? how long do you want to fly?
i mean 20 years ago if you were flying a competition glider with an 049/051 motor pod youd use a super small 4s 200ma nicd pack, put a surface charge on it & hopefully fly one long flight. normal would be about 400-450ma for nicd/nimh for a few flights a day.
3 channels (r/e/a)
3 TG9's, possibly Hs-81's
36" LST Trainer w/ Medallion .049
3 5-7 minute flights, as I could charge in between without problems

Thank you all for the advice and help.
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Old Feb 20, 2012, 01:40 PM
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United Kingdom, England, Brighton
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Originally Posted by NEW222 View Post
Ok. Forgot to add. How does one run a small LiPo battery as a Rx pack? I have not yet fully decided if I am going 72, or 2.4 in this one, just in case it makes a difference. I have a nice new 2s 360 mAh sitting here for a project that got abandoned.
Many of the Spektrum 2.4GHz receivers have a wide voltage range and will accept a 2 cell lipo battery directly. I use a tiny 240mAh 7.4v pack with a Spektrum receiver on a couple of small models.
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Old Feb 20, 2012, 02:00 PM
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How long do your servos last at 7.4?
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Old Feb 20, 2012, 03:29 PM
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Canada, MB, Oakbank
Joined Dec 2004
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Could I use a small esc also? I was thinking a small esc would do the trick? Am I correct? Just a thought.
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Old Feb 20, 2012, 05:26 PM
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NSW, Australia
Joined Feb 2011
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My setup is a LiPo battery with a 5v/3A regulator. Recharge the battery after half a dozen or so flights and you'll be well within its limits and get good life out it too.

I use these BEC's exclusively without problems:

http://www.hobbyking.com/hobbyking/s...dProduct=15212

Cheap, small, light and come fitted with Futaba/JR plug for the receiver. You do need to fit your own battery connection but thats not usually a big deal.

EDIT: You could also use a small ESC as they often have a built in BEC for the onboard electronics. Check its rated high enough though - I allow 500mAh per servo to keep things safe, bit of insurance for stalled servos or low battery packs.

Cheers mate - boingk
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Old Feb 20, 2012, 07:36 PM
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USA, CA, Oceanside
Joined Jul 2008
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I only have 1 1/2A plane so not a lot of experience here but I use a 4cell Nixx that is 600mah. It's way to big for what I need it for but it makes the CG perfect so I use it.

All my bigger glow planes use Lipo's as the RX packs.
The Mah range from 2S 750 all the way to 3S 2200. Again sometimes it's a CG thing and sometimes it's all about keeping things light.

Reguardless they all get a Castle BEC 10A and have had absolutely ZERO power issues even with up to a 8 servo planes.
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