True, but try that in salt water..

It wont do the esc any good being submerged- doesnt matter how waterproof the batts are if the rest of the electronics wont normally survive a good dunking; more luck than good design if they do..

I tend to lean towards Neil on this one.

Water and electricity don't mix well because of the conductivity of the water. Water by itself (distilled water) does not conduct electricity.

It is the Mineral content of the water that makes it conductive. Heavy metals and minerals in the water allow the electrons a path of flow.

DC current flow through water equals electrolysis. This will occur at any connection that isn't completely waterproof.

I dont really think that is an issue for RC vehicles lol. I have never saw or heard of anyone complain about their deans or trx connectors shorting out because of water. Have you?

Not many people have driven their r/cs into the sea- mainly freshwater streams or lakes its mainly the esc that croaks if anything. Corroded terminals aint much fun though, but it all comes down the likely hood of someone needing waterproof electronics enough that they will happily pay over the odds for a bit of silicon to be slapped on the pack. How many of us intentionally drive though water- cant be that many..

Honestly when it comes to this I wouldn't mind ROAR stepping in. At the very least, any ROAR approved pack should be rated with the same standards. Roar can decide what load, voltage etc. As long as all packs where rated the same way it would be a major acomplishment. Maybe the rest of the batteries would wind up being rated the same even if they weren't ROAR approved. I don't care for ROAR but they do have the necessary pull to acomplish this. Plain and simple if your battery is going to be ROAR approved the C rating has to be factual and they test it themselves to make sure it meets the C rating by the guidelines they establish.

Next up, can we have ONE kind of balance tap? PLEASE!!!

Fine idea but ROAR doesn't give a shizz about C-rateings, safety and playing fair is whats most important. MA packs fit the critera since they just puff not explode.

Small pooff . I was hoping Brandon was going to come to the table with some
astranoumical graphs but i guess maxxamps has decided that it may be in there best intrest to leave this thread alone?Go figure ,I wouldnt buy a friggen double a battery from them.

Mr. Mike do you have any input on this yet?

I am not convinced that these hold any advantage over the "Others" as far as lipo's go.
Just more Corporate Hype IMO.

Wow!
 

WOW where did Brandon go to get these graphs and other info to show us how great these new batteries are, China? He must be walking, right? Whats it been a month already since the release of these packs, and promises that they would show us the beef? What a great improvement over their previous reputation. I guess sales must be going so well that he just has not had the time to provide reasonable, honest facts that can show all of us in some way that these new "Race Ready" LiPos really are what they are being advertised. Restored my faith completely, thats for sure.

Hey I have a great idea guys. Lets pull our resources together and go out and purchase some $5 cells somewhere, setup some 4S, 5S, & 6S packs, call them TRUE 500C LiPos with racing flames for wraps, and sell them for lets say 1000% markup, and just tell everyone that the specs will be out soon. After we sell about 1000 packs or so we can just be real quiet and hope that no one will expect us to follow through on any of our advertised Hype, get rich, and then continue making up false claims and advertise even more Hype for some new upcoming products. Sounds like a good company plan to me, what do you guys think?

Sorry I am just trying to think of how to get one of these executive jobs and get rich quick scemes all together in one package/job like we see on TV. Oh wait that's right, that was on that TV's "Most Wanted" show for criminal behavior. I guess it works for some though, right? I wouldn't be able to sleep at night myself. Never mind.

Graphs- Test And Data By MaxAmps.
 

Hi Brandon-
Will the graphs be ready for posting soon? I'm very much looking forward to seeing these graphs. I'm very interested in buying a set of these batteries. I'm just waiting to see your graphs first. Please post any and all data you've been working on regarding these specific model LiPo. ie Graphs, Videos and so on- all of which you have said you would post as soon as you had the time to do so. I would also like to say that you are very professional on this forum. I do hope you will continue to post information as it becomes available to you- onto this thread. I've been eagerly waiting for these graphs and videos you have been working on- and sure hope you can find the time to get these test complete and posted for us- we are all very interested.

PS. I can hardly wait to see the 75amp continuous discharge of this model LiPo. This data alone will show extreme ability.

Note: I had convert my E-Revo to a Brushless E-Revo with the same motor and esc which Traxxas uses in their model- it's the Mamba Monster Electronic Speed Control and the 2200kv Castle Creations Motor.

I was running two 5000mah 3cell 40c continuous 80c Burst Thunder Power LiPo's in series to make a 6cell LiPo- which is what the motor and esc are designed to handle as a maximum voltage. I was doing high speed wheelies through the park and the truck had enough power to pull the front wheels up at apx 50miles per hour. Testing revealed that none of the temperatures were excessive, the motor and esc stayed under 150 degrees, batteries stayed under 110degrees. Gearing was per castle creations tech support suggestions- as well as the setup of the esc.

Running the E-Revo at various different parks or even in a parking lot- is primarily where I run this model RC. I consider this my Basher RC but I don't really jump it or crash it hard- I just pull high speed wheelies and like to go as fast as possible from zero to top speed of this model. Both castle creations tech support and Thunder Power tech support told me this will be fine and the system I have will handle this aggressive driving. After a few runs at the park under the same conditions- I notice the lipos began to puff(only apx 30cycles) And not at any specific time. In other words- they slowly puffed a little more and a little more and the puffing did not go down. I called Thunder Power and they told me I was overdischarging the lipos. I told them I have the LiPo cutoff set to 3.5volts per cell and that I do not run the truck to the point of LiPo cutoff. Jim of Thunder Power explain to me that the motor can also overdischarge the batteries by pulling to many amps. I then called castle creations and they confirm that this system only draws 125amps max. And a 40c continuous LiPo well exceeds this. I called Thunder Power back and they explain in great detail that 1/8th scale buggy is the hardest class of RC on batteries. And that They have to send a new set of lipos to their team drivers about every three months, consistantly. And that lipos raced in 1/8th scale hardly ever last beyond 7 months because of the severe conditions.

I was quite shocked to hear all this because I had thought Thunder Power lipos to be among the best lipos made. And knowing that these lipos by thunder power are under a one year warranty- and Jim telling me that these lipos rarely if ever last 7months- made me wonder why they were not offering to replace my less than 1year old thunder power lipos. In fact- this seem to qualify anyone running 1/8th scale for a warranty replacement after 7months of use(Jim assured me that this goes for all high end LiPo's). I called castle creation tech support and they said it sound like the batteries could not handle the 125amp continuous amp draw I was pulling from the batteries when I would pull a full speed wheelie across the entire field of the park- which could very well take about 5 to 10 seconds at full throttle, or full 125amps continuous, or as castle tech support said- apx 100amps continuous. I imagine MaxAmps is aware that 80% of the RC industry is support by non racers- and people that never go to a track. But rather buy an RC and race it up and down their street(often at full throttle). I happen to do both. I race 1/8th scale buggy which I agree those burst amps are useful to know. But in consideration of the 80% of what these batteries may very well be used for- which is wide open full speed ahead- how fast can I go for how long- those continuous amps sure come in handy. I don't think it hurts to show both the continuous amps and the burst amps. The more information we buyers have access to is the more informed we are. And information on the product is something every racer and basher can appreciate. As for my E-Revo, I've not run it ever sense I found out the batteries could not handle the wide open full speed across the entire park- runs I was doing. I can't tell you how many people would run over to me and ask me where they could buy one of these. And how many dogs chase my RC as well. Many people said they would buy one just to give their pets exercise chasing the RC :)

Note: Brandon- do you think based on the information I provide- I could run 2 6500mah 3cell 150c lipos(in series= one six cell)in my Brushless E-Revo wide open across the entire park which is about the length of three football fields length wise? Without puffing the LiPo's? I've modified the battery boxes so the 3cell 6500mah lipos will fit right in. I just need to know if you think these lipos can handle apx 125amps being drawn from them over the course of apx ten seconds, and then turn around and do it again and again until the lipos are at the 3.5volt per cell LiPo cutoff point- or just before the LiPo cutoff kicks in? Thank you Brandon. I very much look forward to your response.

I'd posted this up a while back but hadn't mentioned which batteries... These were 6500mah 150C's

And everyone please keep it civil...

http://i168.photobucket.com/albums/u...k/1c0eed2a.jpg

So is that 5000 watts @ 27.6V. So .5 Voltage drop per cell under that that peak amperage. Any chance of you pulling a brick to keep the ampdraw high?

What size is that lipo pack that was tested- kinda difficult to tell / determine the voltage drop per cell & generate some actual c ratings without knowing it; 32.3v starting voltage is odd...

Imma pretend that its an 8s lipo pack ( seems if 32.3 / 4.2 = 7.6s, and its several minutes into the run, so... ) for the purposes of this post:

8s lipo = 33.6v

minimum voltage recorded is 27.6v, so thats 3.45v per cell ( minimum voltage, under maximum load )

The highest current ( load ) recorded is 178.1 amps

So, 178.1amps / 6.5amps ( 6500mah lipo ) = 27.4C @ 3.45v per cell

Thats pretty shockingly bad considering these are rated for 75C @ ...3.2v per cell say? ( since MA dont specify the cell voltage held under the 75c load ).

Well, there you go, more false claims by MA, what a suprize. :smile:

Chris, it's hard to see the numbers on the graph so could you post several current/voltage points at various points (preferably not at the very beginning or end)?

Ideally, it would be nice to have the voltage/current immediately before a current spike, and then the voltage/current during a spike.

I'd like to calculate pack internal resistance at various current levels. This will give up an inkling of what to expect at various loads. If we see IR increase dramatically at X amps, it means the pack is getting close to its max discharge value so we can then use that as the "true" C rate.

Could you also confirm cell count and wire gauge and length from battery to ESC. Normal 12GA wire can introduce substantial voltage drop at 178A and would be nice to take that into consideration.

Neil, you math looks good, but the max load will probably happen when the cells are freshest and are able to deliver that, while min voltage will happen towards the end of the discharge cycle where the pack is weakest. This is why we need a number of current/voltage samples across the cycle to get a better data sample.