7-cell vs. 2s lipoly
 

Lol, pls don't hunt me down for running nimh. I wana upgrade my power for my B-day, and my dad told me to consider what i could get with the money i would spend on lipo. So far, i run:

Stampede with:
novak SS ESC
LRP 8.5t X11 motor
6-cell 4200mah pack made of IB cells by proboat


I was thinking of going with a protek lipo ($40 for a 4000mah 2s on amain)
and a Turnigy accucel-6 with 14v 16a power supply
That lipo setup would cost about $175 (I'll also be getting some misc. supplies like heat shrink, wires, connectors, etc.)

I currently have a Dynamite Vision Peak 2 charger that does my current pack pretty good. It only false-peaks occasionally.

Now my really questions: What kind of performance will i see over nimh with that aformentioned lipo or other similar lipo? What are some good 7-cell packs for the stampede?

Thanks in advance!!

The power difference is INSANE. I went from a gp3300 7 cell, to a 2 cell lipo and I was amazed. It was definatly the best thing I have ever done, but im warning you once you go lipo you never go back.

lol, kinda like going purple with Peanut? anyways, what would you guys suggest? I'm looking at zippy packs on hobbycity, but the protek looks good too. any good quality fairly low priced AC or AC/DC chargers out there? thnx

I aggree with this 100%. :yes:

SOOOOOOOOO much more punch from a battery that weighs alot less mah for mah.

This is because even the BEST Nimh battery is VERY limited on maximum discharge. About the best you can hope for is maybe 45 amps. At this rate, the Nimh cells get really hot. Cheaper Nimh cells get so hot, they melt things. LOL

Even a cheap 2S Lipo will outperform the best Nimh packs money can buy.

It's an entirely different chemistry with alot of advantages.

Lipo packs have came down alot in price over the past few years too.

Go Lipo, you'll never go back. But first, research the proper care and charging of them. Always be safe.

:lol: :lol: Jeff Dunham rules!

...and LiPo does too!!! :yes:

Which Protek packs are you looking at?

Which Zippy packs are you looking at?

Haha ill second that. i ran those same batteries and went to 2s 4900mah rhino's with my emaxx and theres such a huge difference. ill never own a nimh again.

I agree too. But don't ask this question over at the Trx forums. I got into an argument with someone saying that NiMHs can be just as good. His "proof" was a clearly biased (and obviously incorrect) graph showing NiMHs doing better than some FP (IIRC) cells of equal capacity. Whatever :sarcastic:. He rambled on how he backs up his statement with "facts", but I guess we can all disregard the numerous graphs out there showing otherwise, in favor of his one questionable graph. :lol:

You need to make sure, that your lipos will be "big" enough to power your motor.
If you get 4000mah 20C lipos, you will get 80A continous out, and if your motor pulls more than that countinous, your lipos will likely heat and lipos dont like heating.

Well I hate to say it but I'm going the other way here.But with good reason.The esc.The Novak ss ESC can not withstand the amps that the lipos can provide to see a big improvement from .Between my SPC 6c 4600 nihm and SMC 5200 lipos there is very little difference in speed using this controller.You can tell a slight difference in punch though.Throw the same batterys behind the vxl esc with the same Novak motor and the speed difference is much greater..Brian I know the graph of which you speak http://pic20.picturetrail.com/VOL133.../351215442.jpg I do believe it to be accurate.However they are the best nihm cells that I have ever seen ran.But I also wonder about how they would perform on a higher discharge with momentary delays to let the voltage recover,if that would net better performance from the lipos.I have a pair of the matched sport packs from there ,and there performance is very close to my Hecell 4000mah 25c lipos.Running both in my Emaxx with an 8xl and MM The nihms pull 39,the lipos pull 40,gps verified.The lipos feel a little punchier,but that could be from weight.Now my SMC's pull 43 with the same setup,and feel way better everywhere.My point is ,there is no doubt that lipos perform better,generally.But the cheaper lipos,compared to quality nihms,they are much closer then I ever would have believed,before I ran the 4600 cells.Also if your other equipment is limited to 30 amps,well then you have other problems besides needing quality lipos.

thats exactly the graph, LOL as if

wow, lost of replies here... I'll get links for the lipos I'm looking at soon... The ESC I'm running is actually a half-breed between the older SS and the newer Havoc systems. I verified with novak, and they say the ESC will do 100 amps cont. no problem.

Thats much less likely then the graph.I don't believe my hv esc will do that.Have you tried them?

What a silly graph. Can we have another that shows a micro t lipo vs a car lead acid battery at 100 amp cont draw. We can then prove that lead acid is better than lipo...

WTF does a cont 30amp load prove? That X battery is better than Y battery at handling a 30amp cont load... When do we have a 30amp cont load in a rc vehicle? This may be better suited to test batts for helis and small planes, but not cars. I want to see a 20c load on all of the metioned cells. Lets see those nimhs pump ot 80+ amps. No temp info on the graph either. All BS IMO.

think it may be time to repost my graph

http://i278.photobucket.com/albums/k...lishplug-1.jpg