Revolectrix

[keithbradley]

Did John really "invent" LiPo batteries??? Says so on his Web Page.

"EXCLUSIVE WORLD FIRST - Blend427
John Grzan (REVOJohn on the forums) has done it again! It has taken a while but since he first developed RC LiPO batteries in 1994 ......................."

Where does it say this Doby? Can you post a link? I went to the site and it said "from the inventors of high discharge lipo in 1996..."

That part I understand.
In 1996, John did research with JJ Hong (Kokam) which lead to the development of the first high discharge rate lipo battery in 1998 (I think it was 5c or 6c IIRC). We're spoiled now with our super powerful 40C+ packs, but back then 5c was a pretty big deal.

The information is out there somewhere but I don't remember where off hand.

[Doby]

Click on KFX dudes link in his signature...I did correct myself in a previous post, as it says "developed"..

[keithbradley]

Click on KFX dudes link in his signature...I did correct myself in a previous post, as it says "developed"..

Ah, I found it. I have no doubt that that's true. He's been a big part of developing lipos for RC, and I think he will be a big part of the future. If you want to see where the future of RC power is headed, follow John. I'm sure the rest of the market will.

[Pitts]

Where does it say this Doby? Can you post a link? I went to the site and it said "from the inventors of high discharge lipo in 1996..."

That part I understand.
In 1996, John did research with JJ Hong (Kokam) which lead to the development of the first high discharge rate lipo battery in 1998 (I think it was 5c or 6c IIRC). We're spoiled now with our super powerful 40C+ packs, but back then 5c was a pretty big deal.

The information is out there somewhere but I don't remember where off hand.

Interesting. We dealt directly with KoKam and could not get anything decent until 2003. Here's a 340mah 3C Latest version I still have "New In Bag" from 2003...

[kfxguy]

Wow...now wee seem to have a real "hater".

If my comments were "jabs" then allow me to apologize for again, complimenting the company for fixing the problem, but then asking about QC issues. I didn't realize that asking questions wasn't allowed on this thread.

I'll only post things that have been cleared by the kfx police in the future. (please note the rather subtle hint of SARCASM in this posting.)

Revolectrix batteries are the second coming of electricity (or something like that in a different thread) and are never to be questioned in any manner by anyone..all hail Revolectrix!!!!!!!!!!!!!!!!!!!!!

As for my experiences with Turnigy's, Nanos Zippys, they are my opinions as they have treated me well over the years....don't like my opinion, tough.

It's ok buddy. It's whatever.

[keithbradley]

Found some info here:

http://www.lithipedia.org/about/4571708072

[Pitts]

Ah, I found it. I have no doubt that that's true. He's been a big part of developing lipos for RC, and I think he will be a big part of the future. If you want to see where the future of RC power is headed, follow John. I'm sure the rest of the market will.

I can only take from this that KoKam didn't take on his findings, or it was too unknown until mid 2000's cos the cells were crap!!! We had no end of trouble, and could have cost me my business!
I cant wait to see where all this technology goes, and what we end up with in my life time...

[Doug Smock]

Easy my good friends kfx & Doby. Let's keep it on the surface.

[Doug Smock]

All hats off. Joe the racer here.

A quick review in the interest of keeping this real fellas just in case something was missed.

Shy of a magic wand I'm not sure how 65c cells that have been assembled become 70C cells.

John can you clear this up for us?

Well Travis that's why I asked John to clear this up.
Personally I would expect the label on the inside of the pack to match the label on the outside.
If it makes any difference I have some of these. Am I convinced they are any better than some other cells I have? No, not at this time. Perhaps I'll have a better idea when I have spent some more time running them through the lie detector.

I'm glad you're happy with them and I hope they give you 300+ cycles.

Shy of a magic wand, I'm not sure you'll see 65 OR 70C cells anywhere. I don't really think there's anything on the market above maybe 40C constant. They won't become a legit 70C no matter what you do.
Maybe they were going to call them 65C and changed their minds at some point? Who knows...quite odd that the inside label doesn't match the outside.

If you want to see where the future of RC power is headed, follow John. I'm sure the rest of the market will.

LOL

A really good first step would be to get real on the C ratings. IME Hyperion is the only manufacture that has done this.

There is no way in good conscious I could sell a 70C battery knowing it's down in the 40C range. Not sure how you guys are able do that.

I did see on the REVO USA Facebook page that the 70C HV packs did stack up pretty well against the Hyperion 35c 6500s. If we can believe that.^^^ There is as we see, so much deception in the battery game.

So realistically fellas. If you are looking for what might be a good "HV" 40 to 45C battery, give these a try..

If you really need the performance of a high capacity, high C rate battery, you'd better keep looking.

Happy Holidays!

Joe

[keithbradley]

^^TL/DR^^

Pitts:

I think you're right, it took a while before the technology made it into our hands.
We are in a market where we receive C-level technology. Despite clever marketing of "cutting edge" technology, we (for the most part) get yesterday's technology, because today's is too expensive to produce for our small market. We are getting closer to current capabilities though, it just takes innovative people to figure out how to make it work. Hopefully we will soon be looking back on the lipos we run today while shaking our heads, because the new stuff is so much better.

[Pitts]

^^TL/DR^^

Pitts:

I think you're right, it took a while before the technology made it into our hands.
We are in a market where we receive C-level technology. Despite clever marketing of "cutting edge" technology, we (for the most part) get yesterday's technology, because today's is too expensive to produce for our small market. We are getting closer to current capabilities though, it just takes innovative people to figure out how to make it work. Hopefully we will soon be looking back on the lipos we run today while shaking our heads, because the new stuff is so much better.

You could be right, although at the time, the cells were for Defense Force application, not RC hobby. Being that it was the ADF, I wasn't working alone on this, so we were supplied the "Latest and Greatest". I actually get the feeling that if the high output cells were developed at that time, they must have not had the reliability (yet!!).
Yep, I cant wait to look back and think of LiPo's the way I think now of Dry Cell and NiCads!!!!

[tlandauer]

So the question for me the Zoom Zoom Guy is that if a 70 C battery is really around 40 C, then where would a labelled 30C or 40C be at?
I am not talking about Nano or Zippy either......

[keithbradley]

So the question for me the Zoom Zoom Guy is that if a 70 C battery is really around 40 C, then where would a labelled 30C or 40C be at?
I am not talking about Nano or Zippy either......

The problem with these ratings is the word "constant". A 350A draw on a 5000 mah lipo is going to cause problems after a number of seconds, regardless of brand. If you consider this rating more of a "burst", it's closer to accurate, but of course that's still dependent on the brand.
I've pulled over 70c for a few seconds from revo hv packs and they performed quite well. I wouldn't discharge anything at 70c for its entire capacity though.

[tlandauer]

The problem with these ratings is the word "constant". A 350A draw on a 5000 mah lipo is going to cause problems after a number of seconds, regardless of brand. If you consider this rating more of a "burst", it's closer to accurate, but of course that's still dependent on the brand.
I've pulled over 70c for a few seconds from revo hv packs and they performed quite well. I wouldn't discharge anything at 70c for its entire capacity though.

Keith, thanks for the reply, think i have a better grasp of the issue!

[flraptor07]

The problem with these ratings is the word "constant". A 350A draw on a 5000 mah lipo is going to cause problems after a number of seconds, regardless of brand. If you consider this rating more of a "burst", it's closer to accurate, but of course that's still dependent on the brand.
I've pulled over 70c for a few seconds from revo hv packs and they performed quite well. I wouldn't discharge anything at 70c for its entire capacity though.

Keith, I'm sure you hit the nail on the head that's where these guys get into trouble! For example, the guy recently on this forum that had 2 4s packs in series for 8s in a 58" V hull boat 5692 1100kv Leopard (I think) and a 240amp SF boat trying to run it WFO. He was discharging his packs at too high a rate and turned the boat into a floating incinerator.