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View Poll Results: Add Another Option: BMN (Bare Minimum Necessities)
no batteries, no charger, and no tx! $59.99(BMN) 713 86.01%
were just asking for too much 116 13.99%
Voters: 829. You may not vote on this poll

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Old Oct 26, 2011, 02:18 PM
F18
Registered User
United States, MA, Onset
Joined Apr 2008
233 Posts
Quote:
Originally Posted by BrownEyedFool View Post
You're the one I need to thank, I saw a post about this method of carrying and keeping 1S cells warm a week or two ago, and followed your lead. Tin card case with a clear plastic window in the front from Lowe's? I bought one based on your description, ran a strip of fine velcro across the middle of it, and now use it to carry my lipos when I walk away from my car/the flight line. Holds 9 Lipos, fits in a coat pocket very nicely.
Isn't it great! There is so much common over the counter stuff that you can adapt to this hobby with a little thought. It was winter flying that made me think of it.....just pack a bunch of Lipos with you in something slim and fireproof. You need a bunch of lipos in cold weather to keep your UMs airborne because of the shorter flight times. I had received a Lowes gift card from the In-laws in the tin and the first thing I thought was......forget the card, what a perfect battery box! (Of course I did not say that out loud in front of the In-Laws!)
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Old Oct 26, 2011, 02:25 PM
Fly em if ya got em.
leethetreeguy's Avatar
Winder Ga
Joined Sep 2008
11,033 Posts
I use the little altoids candy tins for mine. Lee
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Old Oct 26, 2011, 02:30 PM
Registered User
McCarthy, Alaska
Joined Jun 2004
1,133 Posts
Quote:
Originally Posted by leethetreeguy View Post
I use the little altoids candy tins for mine. Lee
Is there no danger of shorting out when putting them in a tin can?
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Old Oct 26, 2011, 02:59 PM
F18
Registered User
United States, MA, Onset
Joined Apr 2008
233 Posts
Quote:
Originally Posted by WSEN View Post
Is there no danger of shorting out when putting them in a tin can?
No....if you look at the micro plug on your Lipos the contacts are fully encased but you can see the embeded contacts from the top of the plug.
The only 1S Lipos I have ever had short out were the ones that the white plug encasement sheared off in cold weather after not so delicate contact with mother earth. Then they start smoken baby when those two contacts touch! They will melt their way down through the snow
And at that point the Lipo is trashed.

Just in case....you space them out in the tin box on velcro that you glue to the bottom of the box. I face the lipos one way in the box when fully charged and then face them the opposite way when they are spent . And get rid of any damaged ones.
I have been carrying 4 250mAh Lipos plus 8 150 & 160s all crammed into my Lowes gift card tin box with no problems. [thank you In-Laws!}

Hope that helps
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Last edited by F18; Oct 26, 2011 at 05:54 PM.
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Old Oct 27, 2011, 03:47 PM
Fly, crash, glue. Repeat.
Belgium, Walloon Region, Plombières
Joined Jul 2011
885 Posts
I put the battery holder from a crashed mSR landing gear on the T-28 the other day. Much nicer than the velcro IMHO, and it lets me use the lipos on both aircraft.

Cost nothing, perfect CG every time, and there's no way the battery will shift in flight. Works great.

- Mark

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Old Oct 27, 2011, 04:17 PM
F18
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United States, MA, Onset
Joined Apr 2008
233 Posts
Quote:
Originally Posted by 4x4rc View Post
I put the battery holder from a crashed mSR landing gear on the T-28 the other day. Much nicer than the velcro IMHO, and it lets me use the lipos on both aircraft.

Cost nothing, perfect CG every time, and there's no way the battery will shift in flight. Works great.

- Mark

Now that is pretty slick! What size lipos can you use with it? I switch back and forth between 160 mAh and 250s on the UM T-28 (on actually all my UMs except the UM Mosquito).
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Old Oct 27, 2011, 04:48 PM
Fly, crash, glue. Repeat.
Belgium, Walloon Region, Plombières
Joined Jul 2011
885 Posts
Quote:
Originally Posted by F18 View Post
Now that is pretty slick! What size lipos can you use with it? I switch back and forth between 160 mAh and 250s on the UM T-28 (on actually all my UMs except the UM Mosquito).
I have 120s, 150s, and 160s and they all fit. Basically the length doesn't matter but width and height do. The wider 270s won't fit.
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Old Oct 27, 2011, 07:04 PM
Fly em if ya got em.
leethetreeguy's Avatar
Winder Ga
Joined Sep 2008
11,033 Posts
I havn't seen a battery that is bigger than 160mah that will fit that holder. But, there are others and other ways of doing it. Just have to get creative guys. It is your plane, have fun. Lee
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Old Oct 27, 2011, 09:14 PM
easily confused
mu2freighter's Avatar
Nashville Metro, Tennessee, United States
Joined Sep 2003
2,183 Posts
Quote:
Originally Posted by 4x4rc View Post
I put the battery holder from a crashed mSR landing gear on the T-28 the other day. Much nicer than the velcro IMHO, and it lets me use the lipos on both aircraft.

Cost nothing, perfect CG every time, and there's no way the battery will shift in flight. Works great.

- Mark
The Miniaviation.com 25C 190mah cell fits the holder. I get at least ten minutes out of one in my mSR.

One of these cells has regularly yielded a good 20 minutes' flight time in warmer weather in the UM T-28 and close to a half hour in my HZ Champ...mind you, that's scale type flying at half throttle a lot of the time, not WOT.

I like the idea of using that holder in my 1S planes, avoids the annoyances of Velcro and would also make all of my 190mah batteries interchangeable between fixed wing and helicopter. My compliments for thinking that up!
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Old Oct 27, 2011, 11:11 PM
Fly em if ya got em.
leethetreeguy's Avatar
Winder Ga
Joined Sep 2008
11,033 Posts
I recant what I said. Yes, I agree, the MA 190's work just fine in that holder. I can confirm that as of this very moment. Lee
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Old Oct 28, 2011, 10:34 AM
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ATC Chilli's Avatar
United States, VA, Purcellville
Joined Aug 2011
651 Posts
Just did some UM flying with a few friends at work this morning. Cold with temps in the low 40's. They were using the Eflite 120's and 150's and could only muster two to three minutes of flight time before the batteries died. I was using the Hyperion 160's and the cold weather didn't appear to effect battery performance very much at all. I think they have realized the extra couple bucks for the Hyperions are well worth the cost difference.
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Old Oct 28, 2011, 10:45 AM
Diverted by planks
tracknoob's Avatar
South Florida
Joined Dec 2010
4,750 Posts
I just ordered some of those MA190's via Ebay, since it looks like my original mcx2 batteries from almost a year ago, converted to UM plane use, are finally dying. They act like they are charged, to 4.20 and stop, but under the load of the plane (only 17 -20 mah/min or so) they have no power.

I think my venom has a discharge function on it which tracks mah out, and I'm hoping that will serve as a way to let me test the remainder of these little batteries to sort the still-good from the weak and needing to be disposed.
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Old Oct 28, 2011, 11:07 AM
Fly em if ya got em.
leethetreeguy's Avatar
Winder Ga
Joined Sep 2008
11,033 Posts
Every since I started running MA190's, all my other batteries sit in storage. Lee
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Old Oct 29, 2011, 07:27 AM
Registered User
Toronto Canada
Joined Dec 2002
5,330 Posts
Quote:
Originally Posted by ATC Chilli View Post
Just did some UM flying with a few friends at work this morning. Cold with temps in the low 40's. They were using the Eflite 120's and 150's and could only muster two to three minutes of flight time before the batteries died. I was using the Hyperion 160's and the cold weather didn't appear to effect battery performance very much at all. I think they have realized the extra couple bucks for the Hyperions are well worth the cost difference.
There is another factor here that should be considered.

Although lipo cells perform poorly in cold weather, it is also possible that the low voltage detection circuitry in the receivers is temperature sensitive.

Has anyone ever put one of their micro aircraft in a freezer to determine if LVC is the same when the electronics are hot or cold?
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Last edited by Martyn McKinney; Oct 29, 2011 at 02:28 PM.
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Old Oct 29, 2011, 01:40 PM
F18
Registered User
United States, MA, Onset
Joined Apr 2008
233 Posts
Quote:
Originally Posted by Martyn McKinney View Post
There is another factor here that should be considered.

Although lipo cells perform poorly in cold weather, it isl also possible that the low voltage detection circuitry in the receivers is temperature sensitive.

Has anyone ever put one of their micro aircraft in a freezer to determine if LVC is the same when the electronics are hot or cold?
Not intentionally......but I left some planes in my trunk overnight last winter after unloading everything else (ie. TX, Lipo box and coffee mug.). It did get down below 20 that night.

When I retrieved the planes the next morning I bench tested one of them to make sure I did not do something stupid. I did not detect any early LVC using the batteries that were at room temperature on a cold plane. So I would say that the cold weather does not effect the circuitry.

I think the early LVC in cold weather can be attributed to both the drop in cold battery efficiency and the increase load from the ice cold electric motors......including the ones driving the micro servos.......the prop is also cutting through very cold dense air increasing the load.

Does that make sense?
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Last edited by F18; Oct 29, 2011 at 02:21 PM.
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