Poly-Power lipos?

[cupracing]

Anyone using these batteries, what's your opinion on them?

[MartinW]

I've been using them in planks for some time and to be honest, considering the value for money I don't think you can beat them. I've got 4 of the 20C 2.2A 3S in my 450 and they seem fine at the moment as I'm only doing lazy 8s. I think I'd probably want a higher C rating for much more than that though.

[cjcj1949]

You can find out how good they are by getting the IR or internal resistance measured. If you can say where you are there will probably be someone who has a charger or meter to do the measurement.

[MartinW]

Pretty sure my field master measures internal resistance. No idea how accurate it is, or what would be considered good, bad or indifferent, apart from I assume lower = better. I guess I have turnigy nanotechs and Overlanders to compare to. Nothing I'd consider high end though like optifuel or Hyperion.

[cjcj1949]

On a 2200mah 25C battery 5 milliohms is about right. I have a Turnigy nanotech 25C and an Overlander 25C that both measure around 10 milliohms. The Tipples came out at 5 milliohms when new but they are over two years old and gradually moving up. The Gensace 2200 30C measure 3 milliohms. The readings were taken on a Wayne Giles meter which measures voltage drop due to a roughly 17amp load. I can't remember the exact figure. In the Summer there isn't much difference between the batteries except that the GensAce has more oomph. The readings are all at 20 degrees C. As temperature drops the resistance goes up a lot and the better batteries are much better. If you don't warm the batteries in the Winter they will heatup due to the higher resistance. If you run for a minute and then leave for a minute to heat through you will get Summer performance.

I have an icharger that sometimes gives ir results that agree with the Wayne Giles meter, but not always. There was close agreement with the 30C GensAce when new, but I get different readings on older batteries. I haven't investigated why.

[whittm]

Sorry to dredge up an old thread, but I've seen these polypower batteries on the web and they seem to be very good value. Has there been any more experience with these since 2012? Are they worth a punt?

[mahbouni]

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[whittm]

Thanks for that, think I'll be trying these out!

[MartinW]

I've not had much use out of my 450 over the summer but I can tell you not to get the '20C' ones as they won't be up to it. Basically, don't believe the guff in the sales pitch about C rating being exaggerated and their 20C's being more like 25 or 30. If you're just hovering which is all I was doing at the time I bought them then that's fine and they are good.

I bought some of the higher rated Poly Power's (sorry can't remember what - 35? / 40?) and they seem to have enough punch. In my planks, the Polys are fine all round.

[mahbouni]

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[MartinW]

The 20C's were getting hot and soft with just a few minutes of lazy 8's on a 450 Sport. So go higher.

[whittm]

They're going on a logo 400 se. Which is about the size of 500 but lighter than some 450's... or so I'm told. I'm interested in the 3650mah 30c one's. they're about 50 quid each.

[swale]

Yes I have been useing them along with a few other team mates for some time now on my 700e and they are fine they exceed there rating.

Do you have just one pack or more than one (wondering if you had a bad one) obviously you've never over charged or discharged?

To be honest for harder 3d mahbouhni is right 6s is much easier on the electronics altogether. If your sport flying its not so much an issue.

[mahbouni]

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[whittm]

So for less money I could get more 20c batteries with a higher mah rating which would mean longer flight times obviously. Am I going to notice the difference between 20c and 30c?