My e-revo brushless edition build

[shaunjohnson]

like i said...
i actually cut out the entire rear section, only leaving that vertical wall where the carbon fiber sticker goes....

then i used some washers and pop rivets to fasten a piece of bent roofing iorn to it. the washers spread out the force a bit.

overkill i know but i broke my first one where i did the same thing but with lexan.

hope you can re-enforce it somehow ;)
maby my method but do it on the inside of the body so you cant see it and leave the existing plastic there...just double it up, pop rivets look nice with washers too

[mistercrash]

I'm having a little fun with my CBA II Battery Analyzer right now, I just analyzed a pair of NEU 5500 mah 2S lipos. From the results, it seems one of the packs (black graph) is failing me. And what do you think of the other one (red graph).

NEU #1 (in black)
Discharge rate: 10 A
Starting voltage: 8.36 V
Ending Voltage: 6.00 V
Total Time: 28 min. 48 sec.
Tested Capacity: 4796 mah

Neu #2 (in red)
Discharge rate: 10 A
Starting voltage: 8.43 V
Ending Voltage: 6.00 V
Total Time: 31 min. 56 sec.
Tested Capacity: 5314 mah

[mistercrash]

I just tested two Turnigy 5000 mah 2S packs and here are the results.

Turnigy #A1 (in black)
Discharge rate: 10 A
Starting voltage: 8.44 V
Ending Voltage: 6.00 V
Total Time: 30 min.
Tested Capacity: 4996 mah

Turnigy #A2 (in black)
Discharge rate: 10 A
Starting voltage: 8.44 V
Ending Voltage: 6.00 V
Total Time: 30 min. 29 sec.
Tested Capacity: 5076 mah



Here are the Turnigy graphs and NEU graphs overlaid for comparison.



These NEU and Turnigy lipos were not bought at the same time but they have similar use, the NEU lipos have 11 cycles more on them than the Turnigys. After the test, the Turnigys got recharged at ''store'' setting on my CellPro 10S with no problems. The NEU packs would not take a charge on the CellPro. I had to wake them up shall I say on my MRC 989, charging at 1 amp until they had about 1300 mah back in them and then switched to the CellPro and only then would they take a charge at the ''store'' setting. I'm a little bit disappointed at these NEU packs. Actually I'm very disappointed.

Any comments suggesting that the tests are bogus are welcomed
And please don't take this as a ''cheap lipos are just as good as expensive lipos''. This is not what it's about, I started using this CBA II thingy with the NEU lipos and I was surprised at their performance. So I thought I would try the Turnigys after, being a little bit afraid of what their performance might be. What can explain this? These lipos were used in the same truck, same gearing and settings, same racing and bashing conditions.

[suicideneil]

What was the C rating on the turnigys & neus?

Suprizing results really, but secretly Im not that suprised, rather happy actually. I believe back in the mists of time it was said that the older neu packs did tend to run warmer and not qive quite as much punch- looking at those graphs, it kinda looks about right (higher IR resulting in lower voltage output). Im no expert on this thing really, just say it as I see it & here it. Would be nice to see a test done with some various other packs like TPs and flightmax & rhino lipos from hobbycity, to see how the bigboys do & to identify the best performing cells/ brand within the hobbycity arena.

All donations to be sent to MC, who will kindly test them and return them afterwards...

[mistercrash]

First time I hear about the older NEUs running hotter. The NEUs are not that much older than those Turnigys. The C rating was 25C constant for the NEUs and 20C constant for the Turnigys. The NEUs show an IR which is double of what the Turnigys have. That's what I see on my CellPro, I know it doesn't have the most precise way of measuring the IR of each cell but even so, don't need much precision to figure out that there's a big difference between 2.1 and 4.3. I plan on getting some Thunder Power and Hyperion lipos at the end of winter. But it makes no sense to get them now and have them sit for three or four months because I don't use my RCs very much in the snow. In the meantime, if anyone wants me to run their lipos on this thing, sure I will I'll send them back with a copy of the test results. I might get this accessory to go with the CBA II and start puffing the really bad cells It lets you test at up to 500 watts continuous. You can test at up to 1000 watts continuous if you use two.

[mistercrash]

I tested the other pair of Turnigys I have and overlaid the graphs of all four Turnigys. It's pretty consistant.

[rawfuls]

Woo, so the packs are pretty reliable, I'm glad I bought em :]

[Bondonutz]

I'd like Jason from MA see that chart of yours, Rock on HC !!

[mistercrash]

He should know a lot about these charts, I read a post from him saying that they use the CBA analyzer to test their cells. They would really need to use the amplifiers offered by the same company to test at really high wattage.
The next lipos I'll be analyzing will be a pair of NEU 3900 4S 25C constant and a pair of Zippy H 3500 4S 20C constant.

[mistercrash]

It's official, I am mad at NEU. Graphs from a pair of NEU 3900 mah 4S 25C constant and graphs from a pair of ZIPPY-H 3500 mah 4S 20C constant. Those lipos have the same age and the same amount of cycles on them. Used in the same truck on mostly a race track. Some of the cycles were for bashing and two cycles each of stop and go running when I was testing that aluminum slipper pad.

NEU 3900 4S #1 (in red)
Discharge rate: 5.90 A
Starting voltage: 16.74 V
Ending Voltage: 12.00 V
Total Time: 36 min. 5 sec.
Tested Capacity: 3545 mah

NEU 3900 4S #2 (in black)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 19 sec.
Tested Capacity: 3470 mah




ZIPPY-H 3500 4S #1 (in black)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 06 sec.
Tested Capacity: 3449 mah

ZIPPY-H 3500 4S #2 (in red)
Discharge rate: 5.90 A
Starting voltage: 16.70 V
Ending Voltage: 12.00 V
Total Time: 35 min. 17 sec.
Tested Capacity: 3467 mah




And all the graphs overlaid on the same chart.



Zippys hold a higher voltage under the same load and yield about the same run time even though they are 3500 mah. The more I play with this CBA, the more I like Hobby King. I'm anxious to get Hyperions and Thunder Powers to analyze those also. But I am not going to get NEU lipos anymore.

[Bondonutz]

Promising news for HC buyers, like myself
As much and strongly as I feel about keeping our money here in the US you can't deny the great deal those HC packs are.

You have any CrapAmps packs to test ??

[mistercrash]

I wish I did have Maxbull lipos to analyze but I never bought any and I don't wish to either. Next lipos I will analyze will be a pair of Zippy-H 5000 3S 20C constant, the very first lipos I bought. And a pair of Flightmax 3000 5S 20C constant. Those are the ones I accidently plugged in series and ran 10S They got really hot when that happened but did not puff. They were soft to the touch though so I'm anxious to see how bad they are They still run without puffing and give me tons of power.

[suicideneil]

Damn, and cool, all at the same time...

Im pretty sure it was the Neus that were said to run hotter than other lipos, but it was a while ago so dont take my rambling as gospel- sure someone else can chime in to either confirm or deny it. Still, I expected the Neus to work better than that- wonder what the newer ones that do higher discharge rates are like?...

[mistercrash]

I knew these 5S lipos I ran on 10S were a little damaged. But still the result is surprising. One falls a bit short compared to the other but until it does, it holds about the same voltage under load than the other. Pretty good despite what they went through Both lipos charge with no problems and all the cells end up perfectly balanced at 4.205 V.

FlightMax 3000 5S #1 (in black)
Discharge rate: 5.90 A
Starting voltage: 20.82 V
Ending Voltage: 15.00 V
Total Time: 27 min. 51 sec.
Tested Capacity: 2736 mah

FlightMax 3000 5S #2 (in red)
Discharge rate: 5.90 A
Starting voltage: 20.85 V
Ending Voltage: 15.00 V
Total Time: 30 min. 27 sec.
Tested Capacity: 2991 mah

[mistercrash]

So who's starting to get bored with my graphs
Here's the result of the pair of Zippy-H 5000 mah 3S 20C constant I have. They are my oldest packs but they are not the ones with the most cycles. Around 20 cycles, I didn't really keep track for those lipos as I use them more for the fun factor they give.

Zippy-H 5000 3S #1 (in red)
Discharge rate: 8.00 A
Starting voltage: 12.47 V
Ending Voltage: 9.00 V
Total Time: 35 min. 04 sec.
Tested Capacity: 4672 mah

Zippy-H 5000 3S #2 (in black)
Discharge rate: 8.00 A
Starting voltage: 12.50 V
Ending Voltage: 9.00 V
Total Time: 35 min. 34 sec.
Tested Capacity: 4738 mah