RE: New 1100 mAh A123 available everywhere and no word here!  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> RE: New 1100 mAh A123 available everywhere and no word here!
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RE: New 1100 mAh A123 available everywhere and no w... - 1/1/2008 4:04:17 PM   
everydayflyer



Posts: 850
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		It will work howeever the 1100s have higher IR and their energy density is lower.
I have ran a 4S of each in parallel and flight time was approx. 25% more and the packs did not discharge evenly.
All things considered adding a cell to the 2300 pack makes more sense as you will increase flight time as much with less cost and weight if you use Throttle management.

Note: To be able to add a cell your ESC must be able to handle the higher voltage.


Charles

< Message edited by everydayflyer -- 1/1/2008 4:06:17 PM >

(in reply to Max1965)
       Post #: 101

RE: New 1100 mAh A123 available everywhere and no ... - 1/1/2008 4:27:44 PM   
Max1965


 

Posts: 55
Joined: 1/9/2006
From: N.W. , FL, USA
Status: offline 		Charles:
25% more and the packs did not discharge evenly.

Did the batteries get hot because of the uneven discharge?


All things considered adding a cell to the 2300 pack makes more sense as you will increase flight time as much with less cost and weight if you use Throttle management.

I am using the MEC packs and I can't add a fifth cell so I figured a 2s 1100 would work...course I guess I could rig up a one cell 2300mah battery.
Throttle management? Not me I'm a nonconformist and speed demon.

The question was just "I wonder" type. Thanks

(in reply to everydayflyer)
       Post #: 102

RE: New 1100 mAh A123 available everywhere and no w... - 1/1/2008 6:36:42 PM   
Mr.Pibb


 

Posts: 59
Joined: 5/5/2006
From: Lewis Center, OH, USA
Status: offline
quote:

ORIGINAL: Max1965

Just wondering something.
Could these 1100mah cells be used as "splits" along with the 2300mah cells? I am thinking along the line of running a 4s1p 2300mah pack with a 2s 1100mah pack in parallel..... Any idea if this would work and what would be the gain in flying time? Right now I am flying about 5 minutes full out on a 2300mah 4s1p pack but I have enough room in the plane for an additional 2s 1100mah pack and any extra flight time would be nice.

Inquiring minds?


You'd need to make it a 4s1p 2300 and a 4s1p 1100 hooked up in parallel or you'll start some fireworks!

(in reply to Max1965)
       Post #: 103

RE: New 1100 mAh A123 available everywhere and no w... - 1/3/2008 3:27:02 PM   
dirtybird


 

Posts: 2818
Joined: 1/25/2002
From: Mesa, AZ, USA
Status: offline 		I have been charging my 3c 1100 battery directly from a 12V lead acid battery with a 1 ohm 10 watt resistor in series to limit the current. I have a sw that shorts out the resistor. I throw that sw after the pack has charged a few minutes. I can recharge in about 10-15 minutes. It seems to work OK.

(in reply to Max1965)
       Post #: 104

RE: New 1100 mAh A123 available everywhere and no w... - 1/3/2008 3:38:34 PM   
everydayflyer



Posts: 850
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline
quote:

ORIGINAL: dirtybird

I have been charging my 3c 1100 battery directly from a 12V lead acid battery with a 1 ohm 10 watt resistor in series to limit the current. I have a sw that shorts out the resistor. I throw that sw after the pack has charged a few minutes. I can recharge in about 10-15 minutes. It seems to work OK.



One ohm sounds high and 10 watts sounds to low.

What gauge and length leads are you using. What is the pack voltage and 12Pb voltage before start of charge and during charge and what is the starting amp. rate?


pack at 8 volts and Pb at 12 volts 1 Ohm resistence = 4A flow and 16 watts.

Charles

< Message edited by everydayflyer -- 1/3/2008 3:43:46 PM >

(in reply to dirtybird)
       Post #: 105

RE: New 1100 mAh A123 available everywhere and no ... - 1/3/2008 8:11:42 PM   
dirtybird


 

Posts: 2818
Joined: 1/25/2002
From: Mesa, AZ, USA
Status: offline 		#20 wire about 3' long
Pb start voltage 12.2V
Pack start voltage 9.6
With resistor in the line charge rate is 1.8A, that is 3.24W
When the resistor is switched out the charge rate is 3-4 amps. When it drops to .2 amp I consider it fully charged.
These are measured valuse not calculated. (Except for the W)
If the pack is fully depleted the voltage will recover to 9.6 when the load is removed. That is if you have not ruined a cell

(in reply to everydayflyer)
       Post #: 106

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 1:02:39 AM   
everydayflyer



Posts: 850
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		I know how to charge with resistor and wire I just wondered why you were using such a high Ohms resistor. I see you are slow charging.

I charge a 3S 2300 pack in 5-8 minutes.

http://www.rcuniverse.com/forum/m_6477096/tm.htm


Charles

(in reply to dirtybird)
       Post #: 107

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 9:54:24 AM   
kent_man


 

Posts: 127
Joined: 11/30/2007
From: Fort Wayne, IN, USA
Status: offline 		I was thinking of picking up a couple of the BD vxp packs to make 2s or 3s batts for my 1/18th brushless truck. I have no experience with lipo's though. I have a Dynamite Prophet Plus charger that will charge 6-7 cell NiMh. What charger should I buy? I'm probably asking for the impossible, but I want a relatively inexpensive balancer charger that would be good for these batts and possibly other lipo's down the road. I would like one that had it's own power supply for ease.(unless it is better and relatively comparable price wise to buy a seperate power supply) Should the balancer be seperate or built into the charger?

What would you recomend?

Thanks in advance,

kent_man

_____________________________

Savage X 4.6, RC18T Factory Team Kit with 6800 mamba, RC18R Niteline

(in reply to everydayflyer)
       Post #: 108

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 2:01:17 PM   
Red Scholefield



Posts: 4622
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: kent_man

I was thinking of picking up a couple of the BD vxp packs to make 2s or 3s batts for my 1/18th brushless truck. I have no experience with lipo's though. I have a Dynamite Prophet Plus charger that will charge 6-7 cell NiMh. What charger should I buy? I'm probably asking for the impossible, but I want a relatively inexpensive balancer charger that would be good for these batts and possibly other lipo's down the road. I would like one that had it's own power supply for ease.(unless it is better and relatively comparable price wise to buy a seperate power supply) Should the balancer be seperate or built into the charger?

What would you recomend?

Thanks in advance,

kent_man

CellPro 4S

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R/C Battery Clinic
www.rcbatteryclinic.com

(in reply to kent_man)
       Post #: 109

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 2:16:26 PM   
kent_man


 

Posts: 127
Joined: 11/30/2007
From: Fort Wayne, IN, USA
Status: offline 		What power supply should I get for the CellPro? Pyramid? How many amps?

_____________________________

Savage X 4.6, RC18T Factory Team Kit with 6800 mamba, RC18R Niteline

(in reply to Red Scholefield)
       Post #: 110

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 2:31:16 PM   
kent_man


 

Posts: 127
Joined: 11/30/2007
From: Fort Wayne, IN, USA
Status: offline 		Ok I guess I need a minimum of 5 amps 25 amps is a little overkill. So which power supply would you recomend? Maybe I should get a high amp one in case I get a different charger.

_____________________________

Savage X 4.6, RC18T Factory Team Kit with 6800 mamba, RC18R Niteline

(in reply to kent_man)
       Post #: 111

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 7:19:57 PM   
SS Pede



Posts: 306
Joined: 2/2/2006
From: Reading, MA, USA
Status: offline 		You should probably get something like a 15 amp power supply. I have a Radio Shack one that works well, but there are many choices.

(in reply to kent_man)
       Post #: 112

RE: New 1100 mAh A123 available everywhere and no ... - 1/10/2008 11:32:02 PM   
thaus


 

Posts: 43
Joined: 11/25/2004
From: vero beach, FL, USA
Status: offline 		There is an ad on rc universe which offer a 10 amp supply for $22. I have one and really like it. This is the best kept secret in the rc hobby.

(in reply to SS Pede)
       Post #: 113

RE: New 1100 mAh A123 available everywhere and no ... - 1/11/2008 12:11:04 AM   
SinCityJets



Posts: 783
Joined: 11/13/2005
From: Henderson, NV, USA
Status: offline 		I wouldn't call 10amps the best kept secret.....Jacked Up Customs makes a great 25amp unit. (available below)

1100mah packs are not going to be good for the 1/18th....well, it will for about 3 minutes. Just an fyi.

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A123 Battery Packs / Trigger Valves / Stretchy Covers / Smart-Fly / Fei Bao / JetCat / Jet Central

(in reply to thaus)
       Post #: 114