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Old 06-25-2008, 07:51 PM   #1
MK Dave
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Default A123 cells and suitable ESCs

I'm thinking about getting some A123 cells but having no experience of them I would like to know if my Lipo compatible ESCs would work and especially cut off at the correct voltage?

All my ESCs are programable via cards with Lipo cut off-of selectable voltage i.e., high, medium and low, so do you just select the voltage that is most approprate and what voltage is this?

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mkdave
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Old 06-25-2008, 09:36 PM   #2
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Use two volts per cell or Auto Ni setting.

A123s have an extremely flat discharge and when they reach approx. 95% empty they drop like a brick.

Use a timer. Setting LVC higher does not help.


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Old 06-26-2008, 03:37 AM   #3
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I've got four packs of A123's, two of 4S1P, and two of 6S2P. The ESC's are Castle creations, I've set them to reduce power at 2.8 VDC per cell which seems to work very well. The 6S2P packs are running at 52 amps, and are only 10 degrees above ambient after a flight. The 4S1P packs are running at 25-35 Amps, same temperature rise. As a rule, I never discharge them more than about 60% of capacity, to allow for aborted landings, go-arounds and the like.

As others have indicated, these cells give full power, until they shut down, and that is very rapidly.

I've been recording total amphours delivered from these packs. One of the 6S2P packs has delivered a total of 95 Amp Hours, with no loss of capacity or increased voltage drop under the 52 Amp load.

Don't EVER short these dang things! The battery will win, they WILL melt anything in their path! (Don't ask how I know)
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