R/C Tech Forums

R/C Tech Forums (https://www.rctech.net/forum/)
-   Electric On-Road (https://www.rctech.net/forum/electric-road-2/)
-   -   EP4200's (https://www.rctech.net/forum/electric-road/179621-ep4200s.html)

bxpitbull 09-01-2007 10:58 PM

EP4200's
 
With all the talk about "how bad Chinese lipos are" and "you cant trust lipos made in China", has anyone thought about all of the 4200's that are failing AND EP4200's....owned and made in China? If there are shortcuts and standards not adhered to in lipo, then why isnt there any outcry in the sub c world???comments.....NO FLAMING!

cannon 09-01-2007 11:19 PM

I think that you will find that all Ni-Mh cells are made in China not just the EP4200 cell

bxpitbull 09-01-2007 11:26 PM


Originally Posted by cannon (Post 3634837)
I think that you will find that all Ni-Mh cells are made in China not just the EP4200 cell

thats the answer I was looking for. If most (I dont think ALL) are made in China, whats to say they arent cutting corners with Nimh, like some claim they are with lipo? when it comes to lipo, if people hear "made in china", they go into hissies, but that sentiment is silenced when it comes to sub c???? why the double standard? With all the 4200 sub c's venting and exploding and the threads to prove it, why are people so mum about it, but if a lipo fails, not :flaming:but doesnt give an hours run time, people are coming out of the woodwork to slam chinese made lipos? I am not a proponent for chinese lipos, but I want equal SLAMMING:lol:

Verndog 09-02-2007 12:00 AM


Originally Posted by bxpitbull (Post 3634847)
why the double standard? With all the 4200 sub c's venting and exploding and the threads to prove it, why are people so mum about it, but if a lipo fails, not :flaming:but doesnt give an hours run time, people are coming out of the woodwork to slam chinese made lipos? I am not a proponent for chinese lipos, but I want equal SLAMMING:lol:

Not sure where thats coming from...I've read many threads and posts on IB's venting and blowing. The main difference IMO is the price of the flame.:lol: More $$ per BTU with a lipo going up in smoke. It's more the people blowing them also. Lipos are more geared for runtime and bashers and still dont have quite the punch of a top end matched IB. The people buying the top end IB's are generally racers, and they understand their running on the edge and dont put up panic posts from a vent of blown pack...they understand it comes wth the territory and just go out and buy another...while the lipo user must do a little :cry::cry: first. :p

bxpitbull 09-02-2007 12:06 AM


Originally Posted by Verndog (Post 3634881)
Not sure where thats coming from...I've read many threads and posts on IB's venting and blowing. The main difference IMO is the price of the flame.:lol: More $$ per BTU with a lipo going up in smoke. It's more the people blowing them also. Lipos are more geared for runtime and bashers and still dont have quite the punch of a top end matched IB. The people buying the top end IB's are generally racers, and they understand their running on the edge and dont put up panic posts from a vent of blown pack...they understand it comes wth the territory and just go out and buy another...while the lipo user must do a little :cry::cry: first. :p

Thats my point. Folks have no problem with chinese made sub c cells, they vent, the explode and its, business as usual. But for those that run lipo, if the pack isnt made by Orion or Apogee, then its a cheap chinese knock off that puts folks in danger. If corners are cut in lipo, that burns and CATCHES HELL FOR ONE ACCIDENT FOR HOW EVER MANY LIPOS, then why not the same "hater-ation" for sub c's made in China? I dont have a problem where cells are made, as long as they perform. But God forbid you dont buy Kokam/orion or Apogee....then they are cheapie chinese lipos. I'm not sure where you are going, but lipo has the same punch 1 minute, 5 minutes, 10 minutes into the pack...sub c's after 2 minutes, punch falls offf. This isnt about punch, but the hater-ation about chinese made lipo and the silence about chinese made sub c's.

SlowerOne 09-02-2007 03:05 AM

First off, you need to read more threads from forums outside the USA, and you will see that there are as many on NiMH issues too. Secondly, the issue with LiPo is that problems can occur when the cells are unattended and not in operation. Thirdly, there is a large concern that users will not follow the instructions, and when this happens there will be problems.

Next, the concern is that if you don't follow the instructions, the cells can go dead in just a couple of low-discharges or overuse. LiPos seem easy to use because our greatest experience is in domestic goods ('phones, laptops, etc.) and these contain sophisticated systems to prevent operator error - they look easy to use because they are error-proofed.

Lastly, and most importantly, the method of LiPo manufacture can be reduced to a level where the dangers are built-in by the manufacturer. This cannot happen with NiMH. Any NiMH cell can be airfreighted anywhere by anyone. Only two manufacturer's of LiPo are approved by IATA for air freight - that tells you something.

If you want to flame NiMH, go right ahead. If you want to know why LiPo are of much greater safety concern when cheap ones are in use, do some homework. You'll find that cheap LiPo are an accident waiting to happen, whereas cheap NiMH are not. Expensive NiMH are at the limit of the technology, and sometimes they fail - that's life. It's no different to the many brushless rotor failures of last year, it's just the price you pay for taking technology to the edge. That's why I don't flame the NiMH producers.

Orion (Kokam) are very high quality, with built-in safety measures, can be shipped by air freight, and you see almost zero complaints. Go on to a 'flying' forum and look for issues with cheaper LiPos and you'll be at your screen for hours!! That's why I flame cheap LiPo - people don't like cheap LiPo, they suck.

Steve B 09-02-2007 08:08 AM

SlowerOne NiMH can fail when unattended has someone on this forum mentioned about their cells blowing up on the back of their truck on the way home from racing and to say that dangers can not be built-in by the manufacturer to NiMH is not true because there has been problems with blocked vents that happened durring manufacture and you can imagine what will happen to a cell that overheats during charge and tries to vent.

Verndog 09-02-2007 10:04 AM

As pointed out...the main reason is the Lipo's are far more dangerous when they go. I've not personally seen a Lipo go, but from what I've read they give anyone a reason to talk (or post) about. A venting C is a bit less impressive. I read this just yesterday...the person reporting on a TC5 tips and tricks had one go (MaxAmps). It took a bunch more equipment on his bench...and this car...I'd be bitching too!! Never seen a nihm come close to that much damage.

http://www.rctech.net/forum/attachme...9&d=1188692513

sportpak 09-02-2007 10:16 AM


Originally Posted by Verndog (Post 3635608)

Holy chit!!:eek: That's a total loss.

Ben

Steve B 09-02-2007 11:48 AM

This year at our clubas far had I know we have had on NiMH explode and one Lipo catch fire.
The NiMH was after the race and caused a minor injury to the racers hand, while the Lipo failure looked more spectacular it did not cause any injury except for the car it was in. With the Lipo there was plenty of warning with all the smoke before it set on fire but the NiMH went without warning.

The problem with NiMH cells that want to vent, is when they can not vent because the vents are blocked the internal pressure can build to dangerous levels.

bxpitbull 09-02-2007 05:53 PM


Originally Posted by Verndog (Post 3635608)
As pointed out...the main reason is the Lipo's are far more dangerous when they go. I've not personally seen a Lipo go, but from what I've read they give anyone a reason to talk (or post) about. A venting C is a bit less impressive. I read this just yesterday...the person reporting on a TC5 tips and tricks had one go (MaxAmps). It took a bunch more equipment on his bench...and this car...I'd be bitching too!! Never seen a nihm come close to that much damage.

http://www.rctech.net/forum/attachme...9&d=1188692513

Not pointing out dangers, just bringing up the issue of how much people have been griping about chinese made lipos and there is no mention of sub c's made in China. Sub c's have had a lot of accidents lately, seems like there are more problems ever since the 4200's have hit the market. Horrible thing with that pic of the car. Thats the first I've seen happen from a lipo mishap...DAMN.

Josh Hohnstein 09-02-2007 05:58 PM

If your gonna bash a nimh battery.....at least bash the right one. :rolleyes:

The track record for ep batteries is a million times better than the ib's

bxpitbull 09-02-2007 06:01 PM


Originally Posted by Josh H (Post 3636267)
If your gonna bash a nimh battery.....at least bash the right one. :rolleyes:

The track record for ep batteries is a million times better than the ib's

I am not comparing EP to IB, just making reference to the bashing of chinese made lipo and nothing said about chinese made sub c's. If they dont fail bravo to them, then whats to say that chinese made lipos have similar standards being met? Thats what my questions and concerns are.

Mike Dumas 09-02-2007 06:11 PM

Just my two cents…

The EP cells distributed by TRINITY Products INC. are far more reliable and durable over the IB cells. I have run both IB and EP cells over time for months now. Not to bash on the IB cells but I have had dead cells right from the manufacturer. The EP cells have not once been dead out of the box and when charging I don’t hear any venting from the cells.

The maintenance process is still the same with having to leave a charge in the cells after use. The cells have a tendency to discharge automatically while sitting on the shelf or waiting for the next time they will be used.

bxpitbull 09-02-2007 06:16 PM

I have to correct my initial post. The hateration is not directed at EP4200's. They were mentioned strictly because they are made in China. Now, if they are of good quality and meet excellent standards, my question is to the chinese-made lipo haters.....are chinese made lipos not as good as chinese made sub c's???


All times are GMT -7. It is currently 02:34 AM.

Powered By: vBulletin v3.9.3.6
Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.