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Old Aug 26, 2015, 09:18 PM
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Battery question for you sport flyers...

… not 3D guys; I know ya'll work your batteries a lot harder.

The question is, given normal usage in a sport plane (i.e., not constant full throttle) and careful maintenance (i.e., storage charge after each use, regardless of how many times I re-charged that day), what is the expected life of a quality lipo battery like the E-Flites?

I have four 4S 3200mAh 20C (Horizon stock # EFLB32004S) sticks that I purchased when I began e-power just over two years ago. They are still going strong, with no apparent diminished capacity or output.

Is this "normal"? How long should I reasonably expect them to last before its time to replace them?

I know that nicads and NiMH can last many years if properly cared for, but I was under the impression that lipos have shorter lives.

Appreciate any information…

.
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Old Aug 26, 2015, 10:29 PM
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I'd expect 2 years would be about average. If they die now you probably did ok, last longer and you're doing well. I had some that died after 6 years. They probably got a cycle maybe 1-2 times per month. I think they lasted longer than I'd reasonably expect.
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Old Aug 26, 2015, 11:34 PM
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5+ years.

Conditions that increase cycle life.
The less the battery is discharged, the longer the cycle life.
The lower the full charge voltage, " " "
The lower the C-discharge rate, " " "
Storage at 3.78V and 40F maximises cycle life.
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Old Aug 27, 2015, 12:00 AM
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I'll go with hoppy on this one. I've had packs providing there well taken care of that have lasted going on 6 years right now. Matter of fact the ones I use in my scale trucks which are super easy on lipos. I'll go 2 straight hours on a 4000 mah pack while we are out just scale trailing. That's just a example of how easy the trucks are on a pack. Anyway my first lipos ever were for my scale trucks and are as good as new and 6 years old. I'm very picky with my vehicles planes and gear. All is kept tip top and the lipos are treated very well. I'm sure this helps.
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Old Aug 27, 2015, 02:19 PM
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E-Flite LiPos are not known to be anything special, not to say they're junk, but I don't think they're any better than any other budget battery.
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Old Aug 27, 2015, 07:38 PM
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Quote:
Originally Posted by SC1 View Post
. . . . . a quality lipo battery like the E-Flites?. . . .
That’s an oxymoron. Quality Lipo battery and E-flite do not necessarily go together.

I had some Thunder Power batteries go for about five years and that was when I didn’t know better and I left them at full charge for long periods.

Now I charge and store my batteries properly but I run them hard (not 3D but hard sport flying) and I’m still happy if they are good for two or three years.
I don’t know if there is a “normal” as you are asking. I just fly ‘em ‘til they are not doing what I would like and then move on. Batteries are cheap these days.
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Old Aug 28, 2015, 06:02 AM
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I have Zippy Rhinos that are at least 5 yrs old and still going strong. A little lower flight time but still working fine.

Gord.
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Old Aug 28, 2015, 09:36 AM
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All this talk about years seems so vague to me. I probably have some rarely used packs that are over 5 years old. On the other hand, the packs for my main models get cycled once a day about 200 days per year. They typically last around 2 years before I see some issues - not dead, but replacing them with new packs produces significantly more power.
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Old Aug 28, 2015, 02:02 PM
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Quite a few of us can't fly every day, or 200 days a year. I'm probably lucky to get out flying 40 days a year, and most of those days I only fly one or two of my planes. That said, when I'm able to fly on a day off work I might be out there for a few hours and put half a dozen cycles on every battery I bring.
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Old Aug 28, 2015, 05:01 PM
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Yes - one person's "lipo-year" could be a very different measure from another person's. I seem to get around 400 cycles out of packs that are moderately highly loaded - say 10Cish. I suspect that would be more or less true whether the cycles occurred in one year or five. I get fewer cycles on EDFs running 20C loads.
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Old Aug 29, 2015, 11:27 AM
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Quote:
Originally Posted by Rhea View Post
I don’t know if there is a “normal” as you are asking.
I'm getting that picture.

.
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