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Old Mar 13, 2012, 11:40 PM
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United States, NJ, Roseland
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LiFe/ a123 rx pack voltage and servos

Hi, when the 2s LiFe packs are fully charged they read like 7.2 volts for a short time then drop to 6.5 and stay that way for the duration. Now i run these on 6v servos and they are fine taking the 6.5 volts. Im a little concerned about the initial 7.2V spike that they see in the beginning. Is this a concern?

My thoughts are to charge the lifes to maybe 95% to avoid this......Your thoughts?
TIA, Dave
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Old Mar 14, 2012, 12:07 AM
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Canada, ON, Owen Sound
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Imo, the "spike" will eventually cause 6v servos to deteriorate at faster levels. Even 6.5v would have the sam effect over time, meaning your servos won't last as long.
I use 2S lipos thru a Bec set at 6v for this very reason. Overvoltage leads to overamping, which will have detrimental results sooner than later.
You could certainly still use A123's thru a 6v Bec if you wished. Any plane big enough to require a separate Rx supply will handle the little extra weight of a Bec. Again, my opinion. Doug B
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Old Mar 14, 2012, 01:43 PM
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United States, OR, Canby
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A 5 cell NiMH battery charges to over 7 volts too, how many people run them through a regulator?
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Old Mar 14, 2012, 03:44 PM
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United States, NJ, Roseland
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Thats true..........From what I read, if I charge these packs the night before i fly, they should discharge to the 6.5v level on their own......No biggie.
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