Nice little lipo

[Serum]

They are not capable of 50C bursts, observing your graphics; they are 25C burst. (would be nice if a lipo company would define their 'burst' i know Flightpowers keep their voltage above 3V on a 50C burst. (at least that's what they claim)

[glassdoctor]

hey Serum... this is a little off topic.. but do you have any info on Flightpower as far as cycle life and/or safety of their cells?

[Serum]

Try contacting them (the guys in the UK) they are always willing to help you out!

[lutach]

I would say they are 50C burst mainly because the max AMP was 128A+ and 128/2.2=58.18.

[sleebus.jones]

Without a set load, those graphs really don't say much about the battery and how it performs. A real discharge graph, discharging at a set load of 10C or 20C would be far more useful in determining the abilities of a battery. You're halfway there, because you already have the datalogging bit of it, you just need a big honkin' load to put across the battery and see how it responds. If you've got the temp attachment, you can use that, and get a temp response graph along with it.

[lutach]

Originally Posted by sleebus.jones

Without a set load, those graphs really don't say much about the battery and how it performs. A real discharge graph, discharging at a set load of 10C or 20C would be far more useful in determining the abilities of a battery. You're halfway there, because you already have the datalogging bit of it, you just need a big honkin' load to put across the battery and see how it responds. If you've got the temp attachment, you can use that, and get a temp response graph along with it.

I was going to get a CBA, but I figured that a heavy 1/8 scale buggy would be enough. I have the temp probes for the DPR, but it just add more wires and the batteries only get warm after each run.

[Serum]

I don't want to burst your bubble; but at this 50C burst the voltage drops to 14V. at 6S that's 2.33V, not capable of 50C at all.

[lutach]

Originally Posted by Serum

I don't want to burst your bubble; but at this 50C burst the voltage drops to 14V. at 6S that's 2.33V, not capable of 50C at all.

Serum,

No one is bursting my bubble. Like I said before, I'm just testing the limits of the batteries. The manufacturer claims they can go to 2.2V safely. I will get one of my touring car out to test it on that as well.

[Serum]

You must admit, that this is an odd way to get the C rating up? it's cool that they stay cool and don't get swollen, but a lipo below 3V is shortened in lifespan.

[glassdoctor]

Yea, even if the battery can drop below 3 volts without any harm at all.... that is not the standard we use to rate lipos.

Also, at such a low voltage performance takes a noticeable hit.

The absolute minimum acceptable would be 3.0 per cell, and we really like to see like 3.2 or so...

[lutach]

I'm just doing this to see if what they claim is true. They say the cells can go as low as 2.2V. I'm not doing this to make everyone go out and try it with their lipos. A few other people in other forums are having great results with this new lipos. The 11.1V 2200mAh packs that I have does out perform my 11.1V 4000mAh MaxAmps.

[Serum]

That doesn't surprise me.. what series of 4k's maxamps have you got? older ones?

[sleebus.jones]

Originally Posted by glassdoctor

Also, at such a low voltage performance takes a noticeable hit.

Agreed. One of the great benefits is the low voltage drop. I woudn't want a pack that drops that low under load, regardless of it's ability to not self-destruct. I'd consider that pack's abilities more of a safety margin in discharging, rather than a higher C rating.

[lutach]

Originally Posted by sleebus.jones

Agreed. One of the great benefits is the low voltage drop. I woudn't want a pack that drops that low under load, regardless of it's ability to not self-destruct. I'd consider that pack's abilities more of a safety margin in discharging, rather than a higher C rating.

The point of me doing this is to see how much abuse this packs can take. This packs were not meant for this kind of use. They are being used in helicopters with great succes. In one graph I ran for over 20mins. without an isseu.

[glassdoctor]

True... although we don't want to have any pack fall on it's face like that, or give it any sort of "c" rating.... it's very nice to know that it won't do any damage.

It's not cool worrying about ruining a $200-300 battery simply by running it a bit too long.