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Old 08-04-2016, 04:22 AM
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I'm at work and can't get to it, but look up the original A123 M1 cell manufacturers data sheet.
Charged voltage should be 3.6v per cell and what you have looks high.

Be mindful that A123 is a brand name and not a chemistry.
Like Kleenex for tissues, or Zerox for copiers.

So I don't know if you have original A123 cells or something else, but this may get you started.

Take care
Bob
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Last edited by bob_nj; 08-04-2016 at 04:41 AM.
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Old 08-04-2016, 04:59 AM
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Dot Com-ing it...
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The termination voltage for A123 batteries is 3.6 volts per cell or 7.2v for a 2s pack. Charging to 8.4v per pack is not a good idea.

Look in your charger for LiFe-Po4 charge program and if it is there, that is the one to use.
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Old 08-04-2016, 05:36 AM
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Thanks for your replys guys I will look at my charger if it is a no go I will have to fork out for a new charger thanks
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Old 08-04-2016, 05:57 AM
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Had a look at my charger and all is OK
Must have been a seniors brain drain
Thanks for your help

John
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Old 08-04-2016, 05:59 AM
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Wait till you get to be my age...
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Old 08-04-2016, 06:06 AM
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Well if you are over 67 well done mate
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Old 08-04-2016, 06:09 AM
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You got me...

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Old 08-04-2016, 03:41 PM
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Quote:
Originally Posted by airservices View Post
Hi Guys
I have a Bantum bc6 charger and have just got into A123 batterys
When I balance charged them they read 8.4 volts full
is this too much for these batterys ?
thanks
John
Wow, you setup the charger for LiPo batteries not LiFe's. 8.4 is the termination voltage for a two cell LiPo pack and as others have noted, it's 7.2 for LiFe/A123's quite quicking dropping to 6.6.

Oh, you got me by two years but I'll be 66 pretty quick.... lol
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Old 08-05-2016, 05:34 PM
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http://www.mini-iac.org/Articles/Art...A123-UNCLOUDED

CLICK ON ABOVE:
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Old 08-05-2016, 07:15 PM
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Very interesting article thanks for that
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Old 08-06-2016, 09:37 AM
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Yeah~ try the other left
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You're very welcome!
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Old 09-02-2016, 11:19 PM
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Cycling details required.

When cycling these A123 cells, what voltage per cell should they be discharged to please?
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Old 09-02-2016, 11:33 PM
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Originally Posted by Zeeb View Post
Wow, you setup the charger for LiPo batteries not LiFe's. 8.4 is the termination voltage for a two cell LiPo pack and as others have noted, it's 7.2 for LiFe/A123's quite quicking dropping to 6.6.

Oh, you got me by two years but I'll be 66 pretty quick.... lol
Float voltage of a123 is 3.45V... you will get 6.9V, not 6.6V...
Most "6V" servos do accept 7.0V... checked with savox, hitec, futaba and hxt...
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Old 09-02-2016, 11:35 PM
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Originally Posted by Jim.Thompson View Post
When cycling these A123 cells, what voltage per cell should they be discharged to please?
Why do you want to cycle them ?
Minimum voltage is 2.0V...
Never NEVER let them go to 0.0V... that would kill them...
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Old 09-03-2016, 12:06 AM
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Quote:
Originally Posted by Jim.Thompson View Post
When cycling these A123 cells, what voltage per cell should they be discharged to please?
Okay, some misconceptions here....

Remember that these cells were originally used in DeWalt cordless power tools. Those get run until they quit, then recharged and all those packs had balancing circuitry, trust me, those of us who harvested the cells from those battery packs can tell you the same.

When I cycle my A123's for cell balance issues, I take them down to 2.5 volts per cell under a 3 amp discharge load. When done, they'll usually rebound to almost 6 volts on a two cell pack. I do that three times. If there is still a problem, I run 'em down to 2.0 volts per cell and they'll usually rebound to about 5.5 volts per two cell pack when the load is removed. I've not had an issue yet with a CellPro charger not recharging them at that level.

Worst case scenario is if you run 'em dead. In most cases they can be rejuvenated by "jump starting" the charger to get some power in then go to the A123/LiFe chemistry.

Yes they will "float" about 3.45 volts per cell when taken off the charger and allowed to sit for a few minutes but when you put a load on 'em, they drop to 3.3 and pretty much stay there until they fall off the cliff. Five cell NiCD or NiMH come off the charger at about 7,2 volts and drop pretty quickly to 6.9 and then gradually decrease as they discharge to about 6.1 volts which is where you better charge 'em as there's not much left.

In short; any component rated for "6 volts" means it'll take a five cell NiCD/NiMH and with those voltages, anything rated for that will take a two cell A123/LiFe pack. While they do not like being completely drained, that is not the end of the A123 cells, I cannot speak to the LiFe as I only run the A123 brand cells for my flight packs.
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