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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> THE a123 charger
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THE a123 charger - 4/29/2007 8:48:18 AM   
ramboman


 

Posts: 32
Joined: 12/16/2004
From: waterloo, AR, BELGIUM
Status: offline 		Keep it simple and stupid!
Strictly following a123 specifications:
- buy a CCCV power unit (I use a 20amps 50volts from Tanic)
- set max current to 3amps per cell (or 10amp for fast charge)
- set max voltage to 3.6volts per cell
Just wait...
For my 10s2p I set it to 20amps 36volts for fast charge,
there is no alternative!
       Post #: 1

RE: THE a123 charger - 4/29/2007 9:55:38 AM   
jasonwang3a



Posts: 69
Joined: 10/18/2006
From: shenzhen, CHINA
Status: offline 		you are right, any lithium battery is dangerous with charging in wrong charge mode.

nimh and nicd battery is charged with CC, Lithium ion , lipoly , liFEPO4, lead acid or VRLA battery is charged with CC and then CV. Different electrochemical system has different charging mode...

_____________________________

Jason

(in reply to ramboman)
       Post #: 2

RE: THE a123 charger - 9/10/2007 12:06:37 AM   
Ionikios



Posts: 19
Joined: 9/8/2007
From: ARLINGTON, WA, USA
Status: offline 		Is the LiFePO4 as critical as the other lithium batteries as far as fire or explosion danger?

I'm sitting up 6-RCR123As - (LiFePO4) -series parallel to 6V and using a 6v reg. for safety measure as Rx batt. setup and haven't seen any around. Will that work ok?

< Message edited by Ionikios -- 9/10/2007 12:09:20 AM >

(in reply to jasonwang3a)
       Post #: 3

RE: THE a123 charger - 10/15/2007 10:32:48 PM   
skyrider2



Posts: 20
Joined: 9/24/2002
From: Ocala, FL, USA
Status: offline 		Ionikios,
Sounds to me like you are building a 2S3P A123 battery pack. The A123 cell is rated 2.3 volts and 2300 mah. Doing the math (three parallel strings of 2 series cells) that's 6.6 volts at 6900 ampere hours. That's an awful lot of power for a receiver. Most are using just 2S1P for the receiver.
Remember, most receiver batteries that come with radio systems are 500-600 mah NiCad or NiMh packs.
skyrider2

< Message edited by skyrider2 -- 10/15/2007 10:36:09 PM >

(in reply to Ionikios)
       Post #: 4

RE: THE a123 charger - 10/15/2007 11:42:19 PM   
Red Scholefield



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

ORIGINAL: Ionikios

Is the LiFePO4 as critical as the other lithium batteries as far as fire or explosion danger?



So far than been no reported incidents with A123 technolgy.


_____________________________

Red S. AMA 951
R/C Battery Clinic
www.rcbatteryclinic.com

(in reply to Ionikios)
       Post #: 5

RE: THE a123 charger - 10/18/2007 1:06:02 AM   
everydayflyer



Posts: 852
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		As preveous post stated a 2S A123 is all that is needed for a receiver / servos power.
2300 mAh , more amps than 10 digital sevos can use and no regulator required as voltage will be very close to the same as a 5 cell Ni pack.

Charles

(in reply to Red Scholefield)
       Post #: 6

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