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Old Apr 08, 2011, 09:20 AM
Ghia is offline
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USA, NM, Albuquerque
Joined Jul 2003
526 Posts
I have a A123 hacked Astro 109 charger that faults

everytime I try to charge a 2s1p A123 pack it faults out during stage 3 or about 3.4v per cell at a 3amp charge rate. I can never get to the 3.6v required so my pack isnt fully charged.

Any ideas? everything else works fine on this charger
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Old Apr 08, 2011, 09:56 AM
everydayflyer is offline
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Haralson County GA. USA
Joined Oct 2004
34,859 Posts
Try reducing the charge rate in stage three or change the resistors to increase the cut off point. There is no reall capacity above 3.45 per cell but some want really full cells.


My original charging A123 Thread. First pots had a lot of data and graphs.


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