THE a123 charger (Full Version)

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ramboman -> THE a123 charger (4/29/2007 8:48:18 AM)

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!



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

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...



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

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?



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

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



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


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.



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

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



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