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Old Dec 22, 2013, 10:08 AM
LSF - IV
Hostage-46's Avatar
United States, TX, Highland Village
Joined Jan 2003
3,116 Posts
Discussion
A123 packs?

Guys I made the move to Life packs a few years back, running Hyperion 1450 and 2100 packs. I love the technology. Show up at the field, charge and fly it.

In my supra I ran a 2150 in the nose with zero ballast, it's a big battery but my theory was/is I'd rather carry power than lead...

So the Xplorer is to arrive any day, space seems to be more of an issue on this ship. I need to get a telemetry module in there as well which I suspect I can manage with a 1450 Hyperion pack.

I paid a visit to RClipos (great vendor) and came across an A123 battery pack that looks promising. Its the AR26650-2S1ps. Basically a longer more narrow end to end stick config.

Has anyone tried this pack? Any thoughts?

Dan in Dallas...
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Old Dec 22, 2013, 01:14 PM
Slopers Anonymous
bobbyjack's Avatar
USA, WA, Graham
Joined Feb 2002
244 Posts
Quote:
Originally Posted by Hostage-46 View Post
Guys I made the move to Life packs a few years back, running Hyperion 1450 and 2100 packs. I love the technology. Show up at the field, charge and fly it.

In my supra I ran a 2150 in the nose with zero ballast, it's a big battery but my theory was/is I'd rather carry power than lead...

So the Xplorer is to arrive any day, space seems to be more of an issue on this ship. I need to get a telemetry module in there as well which I suspect I can manage with a 1450 Hyperion pack.

I paid a visit to RClipos (great vendor) and came across an A123 battery pack that looks promising. Its the AR26650-2S1ps. Basically a longer more narrow end to end stick config.

Has anyone tried this pack? Any thoughts?

Dan in Dallas...
I've used this pack in a couple of planes for some time now although they're home made packs from DeWalt cells. They work just fine if you've got the room but it's not a small pack at 1.1" x 5.3". I did manage to squeeze one in my Tomahawk and it works well as it eliminated the need for any ballast (and I can probably fly all day) but I don't think it'll fit in any other F3x I have. I also have one in a Jart M70 and one will be going in my Big Ceres when I get around to building it this winter. I also bought one of the AR18650-2S1PF to replace a home made pack for a Tragi I have but have yet to fly it, I'm sure it will work just fine.
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Old Dec 22, 2013, 02:10 PM
PaulG
Newcastle, NSW Australia
Joined Dec 2004
312 Posts
Fosa Lift

I use a home made pack of the 18650 cells in line in my Fosa Lift. I put the receiver on top of the rear cell and it all fits - just!. I think that the genuine A123 cells are the best and although the cells have a capacity of 1100 mAhr the quick recharge time makes this no problem. I just wish they had a cell between the two sizes .
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Old Dec 22, 2013, 02:14 PM
Registered User
Avaldes's Avatar
United States, CA, San Luis Obispo
Joined Aug 2006
1,502 Posts
Pat at RCLIPOS.com is a great supporter of the hobby. I have been buying batteries and chargers from him for quite a while. He does a great job of keeping up with current battery trends and I continue to use his shop for my battery needs. I use the Hyperion 1450's in the nose of my F3B models and the 2150 in the nose of my Maxas. I trust these batteries completely.
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Old Dec 22, 2013, 02:54 PM
LSF - IV
Hostage-46's Avatar
United States, TX, Highland Village
Joined Jan 2003
3,116 Posts
Pat is the best, my only place for batteries
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Old Dec 22, 2013, 03:05 PM
Eggcellent...
tewatson's Avatar
United States, CA, Orange
Joined Oct 2006
2,426 Posts
A123s are great batteries...the only issue is the limited selection of cell sizes (just two). If you have the room, use them. I get mine from RC Lipos.

Tom
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Old Dec 22, 2013, 09:38 PM
Jeff Carr
Ft. Mill SC / Charlotte NC
Joined Mar 2001
2,661 Posts
I use the A-123 cells 2300 in my Tragi 801. Great cells and I throw 8 amps at them all the time. From about 50% to full in about 6 mins

Jeff
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Old Dec 24, 2013, 07:25 PM
Detail Freak
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Harbor City, CA
Joined Oct 2003
21,402 Posts
Jeff-

I thought that most of the A123's stated a 1C charge rate? Maybe its just the smaller 18650 (1100Ma)cells.

Anyway, I have a home made 18650 pack of A123's in my beater Supra and they have been stellar for me so far.
I stick to what was written on the label, 1C charge rate max. Only replacing 350Ma after a day of flying doesn't take me long anyway.

@Dan-
If you have to, you CAN get two other options in a Hyperion pack-

1. Slide in an "850Ma" pack.... Yes, a little smaller, but not too long ago guys were using 600Ma AA cells in TD planes....

2. Hyperion makes a 1700 "square pack" that is basically the size of an AA square pack. I have one in my Oculus, it fits great. Any plane that can take a AA square pack should be able to fit this 1700 in it... Its basically a good "update" pack for the old AA's.
Its twice as wide as the 850 packs, because its made of 2S2P850's.

http://www.rclipos.com/Hyperion_Receiver.htm

http://www.hyperion-eu.com/products/...-FG305-1700-2S

R,
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Last edited by target; Dec 24, 2013 at 07:32 PM.
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Old Dec 25, 2013, 02:25 AM
RIP MC
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United States, CA, Midway City
Joined Dec 2003
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Quote:
Originally Posted by target View Post
Jeff-

I thought that most of the A123's stated a 1C charge rate? Maybe its just the smaller 18650 (1100Ma)cells.

Anyway, I have a home made 18650 pack of A123's in my beater Supra and they have been stellar for me so far.
I stick to what was written on the label, 1C charge rate max. Only replacing 350Ma after a day of flying doesn't take me long anyway.

R,
Target
Hey T and others, the A123 1100 cells are still my preferred battery if the electronics can handle them. They can be charged at 5c with no negative effects. They can even be charged at 10c's but I am not sure if there are long term negatives at that rate.
http://www.rcgroups.com/forums/showthread.php?t=969065
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Old Dec 25, 2013, 11:46 AM
Detail Freak
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Harbor City, CA
Joined Oct 2003
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Quote:
Originally Posted by fnnwizard View Post
They can be charged at 5c with no negative effects. They can even be charged at 10c's but I am not sure if there are long term negatives at that rate.
http://www.rcgroups.com/forums/showthread.php?t=969065
Where are you finding the 5C info, Tuan?
Merry Xmas to you and your gals.

R,
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Last edited by target; Dec 25, 2013 at 01:25 PM.
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Old Dec 25, 2013, 12:35 PM
Jeff Carr
Ft. Mill SC / Charlotte NC
Joined Mar 2001
2,661 Posts
My cells all came from the Dewalt packs. At 8amps they just laugh. They have never gotten warm

Now the down side to these are the size. The 2300 mil packs are the size of a "D" cell just slightly longer. The 1100 mil cell are like fat "A" cells

I use the 2300 in a stick. I also do this with the 1100 cells but sometimes use them in a side by side configuration.

I use the 2300 mil packs in my Tragi's. Very little to no nose weight is added. The 1100 mil cells are used in my ALES Tragi. I don't trust BEC's so use these for the E -Sailplanes

I add balance tabs but they very rarely need balancing. In the battery section on the groups there was someone who did hundreds of charge and discharge cycles where I believe we're charged at 3+C and discharged at 60 amps. I could be wrong on the charge discharge part but he saw no ill effects to the cells. These cells can also be zip charged in a matter of minutes to 90% of full capacity.

The other LiFe packs can not take this kind of abuse. So 1-3c is all that should be used

Jeff
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Old Dec 25, 2013, 12:49 PM
RIP MC
fnnwizard's Avatar
United States, CA, Midway City
Joined Dec 2003
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Quote:
Originally Posted by target View Post
Where are you finding the 5C info, Tuan.
Merry Xmas to you and your gals.

R,
Target
My Wife says Merry Christmas to you and yours too!
I don't have any of the A123 spec sheets anymore, but I am sure they had at least a 5A fast charge rate recommendation.
I know of at least one NASA test with the 18650 cells and 10A charge rates gave like over 2000 cycles under normal accepted values (80%). Try doing a search.
t
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Old Dec 25, 2013, 01:25 PM
Detail Freak
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Harbor City, CA
Joined Oct 2003
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Thanks gents.
Have a memorable Xmas all.

R,
Target
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Old Dec 26, 2013, 02:04 PM
Slope fanatic
South Africa, WC, Paarl
Joined Jan 2012
63 Posts
Hi

Adding a simple silicone diode in series to the pos. lead will drop 0.7V off a 2 cell A123 battery and supply a safe 6V.

It is best to add this between the switch and the rx, otherwise you will have difficulty with charging...

Cheers.
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Old Dec 27, 2013, 08:31 PM
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irvine, ca
Joined Apr 2002
241 Posts
Performance and Safety Evaluation of High-rate 18650 Lithium IronPhosphate Cells
Judith Jeevarajan, Ph.D. NASA- JSC
Brad Strangways and Tim Nelson Symmetry Resources Inc.
NASA Battery Workshop November, 2009

http://www.2a3a.ru/wp-content/upload...Safe_18650.pdf


Lithium Iron Phosphate Applications in Space Power Batteries

https://batteryworkshop.msfc.nasa.go...att_MWixom.pdf

Lithium Iron Phosphate Cell Performance Evaluations for Lunar Extravehicular Activities

http://www.ntrs.nasa.gov/archive/nas...2007033092.pdf
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