A123 Failure Modes (Full Version)

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gharm -> A123 Failure Modes (2/5/2008 3:02:45 PM)

I am using A123 receiver packs in several airplanes. I was going to set up dual receiver packs for two larger airplanes but am concerned about the potential for single cell failure due to internal short in one cell. Is there any potential for this type of failure? With dual 5 cell Nimh and NiCad my tests show no problems with one shorted cell, but I can see the potential for trouble with such a great voltage differential between 2 packs.



SilverFoxCPF -> RE: A123 Failure Modes (2/6/2008 4:25:50 AM)

Hello Gharm,

I have been playing with the smaller 18650 A123 cells and have had a couple of them die by going open circuit...

I don't believe this is a normal failure mode, but it is something to consider.

Tom



everydayflyer -> RE: A123 Failure Modes (2/9/2008 12:17:27 AM)

quote:

and have had a couple of them die by going open circuit...


Any that were not charged to over 4.2 volts?

Charles



SilverFoxCPF -> RE: A123 Failure Modes (2/17/2008 12:39:22 AM)

Hello Charles,

No.

I have been regularly charging them to 4.2 volts without problems. I ran into an application that had a built in charger. Unknown to me, it charged to 4.6 volts. The cells took one cycle of this, then went open during the second cycle.

Tom



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