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Old Nov 08, 2010, 05:18 PM
R.C. Aviation Fanatic
Razors edge 29's Avatar
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Mini-HowTo
Ultra Micro 1S lipo warmer packs (socks)

I have decided to try to make some socks if you will to keep my 1S lipo batts warmer in colder temps.

I am using that thin packing foam as the insulator and simply making a cylinder and gluing together - well this as far as I have gotten now.

I have rolled the pieces over to accomodate for the different batt sizes I used

one will be for 500 MAH Blade SR 120 batts
one for any single cell stick lipos such a the Hyperion 160 MSH
one for the hyperion 180 MAH batts.

I have secured with foam safe CA and pins to hold in place.

Once this is dry, I will trim, glue the ends of each sock and then use a tiny bit of velcro maybe where the battery connectors will come out of.

See pics below of current progress.

Has anyone else done anything like this before, and if so how?

thanks

Ryan
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Old Nov 09, 2010, 09:54 PM
R.C. Aviation Fanatic
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First Batch

Well the Foam safe CA didn't hold the foam - so I ended up using a tiny bit of low temp hot glue, which will in fact melt this foam wrap, if you're not careful.

I used velcro to seal the connector end of the sacks on all but the 150 lipo sack.

These sacks aren't pretty by any mean, and they're untested thus far, BUT I will report my findings when I have time to test them.

Here are the weights

Hyperion 180 MAH 1S without sack = 5.84
Hyperion 180 MAH 1S with sack = 6.44

a difference of = .6 grams.


EFlite 150 MAH 1S without sack = 4.62
EFlite 150 MAG 1S with sack = 4.98


A difference of = .36 grams

EFlite 500 MAH 1S without sack = 13.85
EFlite 500 MAH 1S with sack = 15.0

A difference of = 1.15 grams.


As you can see, the weight gain isn't really all that bad.

Hopefully I can test them soon.

Thanks

R
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Old Nov 10, 2010, 05:58 AM
Canadian Bacon
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Kingston, Canada
Joined Jun 2004
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I've been using these for a few yrs. Pretty much the same as yours but held together with hockey tape. Batts come out at about the same temp as in the summertime.

Gord.
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Old Nov 10, 2010, 06:26 AM
Way to many airplanes!
Canada, QC
Joined Oct 2009
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Quote:
Originally Posted by Razors edge 29 View Post
EFlite 150 MAH 1S without sack = 4.62
EFlite 150 MAG 1S with sack = 4.98


A difference of = .36 grams

Well, did you weight the battery without sack, with a velcro on it? Because that's what you would have to do, since you cannot the battery alone without a velcro. So basically, the only added weight is the sack itself, since in both case, you need velcro.

I've been using mits as well since last winter, and I love it. Mine are made of neoprene which does glue better, and hold together longer. Velcro also stick better. But they are heavier. Still better than not being able to fly my 1S models during winter because the battery freeze, so welcome to the club!
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Old Nov 10, 2010, 07:01 AM
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Haralson County GA. USA
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Not only for 1S Micros. I started using the same type pockets on flat plate foamies using 3S 1320 over 5 years ago.

Charles
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Old Nov 10, 2010, 07:17 AM
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Sweet and they work well I guess

Good news.




Quote:
Originally Posted by flypaper 2 View Post
I've been using these for a few yrs. Pretty much the same as yours but held together with hockey tape. Batts come out at about the same temp as in the summertime.

Gord.
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Old Nov 10, 2010, 07:18 AM
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No I left Velcro in the 180 batts because use it indoors as well.






Quote:
Originally Posted by RealGambler View Post
Well, did you weight the battery without sack, with a velcro on it? Because that's what you would have to do, since you cannot the battery alone without a velcro. So basically, the only added weight is the sack itself, since in both case, you need velcro.

I've been using mits as well since last winter, and I love it. Mine are made of neoprene which does glue better, and hold together longer. Velcro also stick better. But they are heavier. Still better than not being able to fly my 1S models during winter because the battery freeze, so welcome to the club!
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Old Nov 10, 2010, 07:19 AM
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Good point






Quote:
Originally Posted by everydayflyer View Post
Not only for 1S Micros. I started using the same type pockets on flat plate foamies using 3S 1320 over 5 years ago.

Charles
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Old Nov 11, 2010, 08:04 PM
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Great news

I just tried my lipo sock warmer on my 120 SR which had previously been hard to fly in colder temps, and now has no issues.

Current temps are 43 F or 4 Celsius
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Old Nov 11, 2010, 08:36 PM
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saran wrap anyone?
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Old Nov 11, 2010, 08:49 PM
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haven't tried that
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Old Nov 12, 2010, 07:53 AM
Too much is just not enough...
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Do you think if you could keep the batteries warm prior to use, that they would work OK?
We did some of that last fall and it seemed to help. If the battery gets cold, prior to use, they don't work so well.
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Old Nov 12, 2010, 09:23 AM
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I have read that BUT didn't work for me.




Quote:
Originally Posted by Woody_99 View Post
Do you think if you could keep the batteries warm prior to use, that they would work OK?
We did some of that last fall and it seemed to help. If the battery gets cold, prior to use, they don't work so well.
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Old Nov 12, 2010, 10:06 AM
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Quote:
Originally Posted by Woody_99 View Post
Do you think if you could keep the batteries warm prior to use, that they would work OK?
That would depend on the battery's internal resistance and how many amps you pull from it. It is a balancing act between heat generated by discharge current and heat lost to surrounding air. As long as the the temperature stays within battery's comfort zone, it will work just fine. On low-power applications some additional thermal insulation can be a significant help. Definitely do keep the batteries warm before use.
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Old Nov 12, 2010, 10:16 AM
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One of the guys in the club uses one of those foam cooler/ heaters that plugs into a cigarette lighter to keep the batts warm. At the field he plugs it into his 12V charger power supply. We use a 110 volt generator plugged into an outlet outside to power the wiring in the clubhouse.

Gord.
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