LiFe/ a123 rx pack voltage and servos - RC Groups
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Mar 14, 2012, 12:40 AM
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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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Mar 14, 2012, 01:07 AM
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Doug Bartley's Avatar
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
Mar 14, 2012, 02:43 PM
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A 5 cell NiMH battery charges to over 7 volts too, how many people run them through a regulator?
Mar 14, 2012, 04:44 PM
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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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