MaxAmps Race Edition Lipos

[Arct1k]

If you look at the time series this is about 10 mins into play time hence battery voltage down... However this is where the largest amp spikes were - I zoomed and increased the upload resolution.

In real world terms these packs do seem to work well with the MMM-XL in this application.

[Arct1k]

And the first large spike of the run...

[brushlessboy16]

Ehh dropping to less than nominal voltage

Going by the max wattage (assuming that max amp draw coensides with the lowest voltage)

3958/30.0= ~132amps.

30/8= 3.51v per cell if I have you setup correct


What are these cells rated for?

[Arct1k]

Originally Posted by brushlessboy16

Ehh dropping to less than nominal voltage

Going by the max wattage (assuming that max amp draw coensides with the lowest voltage)

3958/30.0= ~132amps.

30/8= 3.51v per cell if I have you setup correct


What are these cells rated for?

kids today 30/8 = 3.75V @ 135 amps

they are 6500mah packs which probably means 6000mah usable i.e. 135/6000 = 22.5C spike

[brushlessboy16]

Originally Posted by Arct1k

kids today 30/8 = 3.75V @ 135 amps

they are 6500mah packs which probably means 6000mah usable i.e. 135/6000 = 22.5C spike

my mistake I was going by the 28.2v Min voltage. was looking at the wrong graph and did my wattage calculations off that one.

[BrianG]

Those cells don't seem too bad. It's still hard to get exact V/A testpoints, but I calculate pack resistance somewhere between 1.4mOhms-3mOhms.

We can't forget that's pack resistance, and includes the wires and connectors. I don't know why they'd use 12AWG on cells with 150C claims, but 200mm of 12AWG wire will introduce around 1mOhm of resistance by itself.

That brings pack resistance to between 0.4mOhms and 2mOhms. Not bad at all for an 8 cell pack IMO.

Although, I still don't think these are truly "150C" rated. Given the price, I know I still won't be buying them anytime soon.

Originally Posted by MindThoughts

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.

Yes our 150C packs can handle the load. We have tested them at a higher amp draw then that.

Brandon

[josh9mille]

Originally Posted by brandonwilcox

Yes our 150C packs can handle the load. We have tested them at a higher amp draw then that.

Brandon

Can we see?

[sikeston34m]

Originally Posted by brandonwilcox

Yes our 150C packs can handle the load. We have tested them at a higher amp draw then that.

Brandon

Well. Well.

Where've you been Brandon?

It's kinda funny that you "show up" when some "proof in the pudding" is on the table.

IMO, it's too bad that it wasn't you, that offered real world graphs up, like you said you would do.

You might have won some respect here.

[MindThoughts]

Awesome, Thank You Brandon.
I truly appreciate your continuing to post onto this thread. I know the forum owner has asked a few times for members to keep their post civil. And I certainly respect Monster Mikes Forum :)

PS. I'm looking forward to your data, test & graphs and videos. Any information on these race lipos will be extremely valuable and interesting to see and learn about. Thank you for being so open about doing this for us. I've never heard of Thunder Power doing any test for us racers, and those are also quite expensive lipos, and I personally would like to give other lipos a try- such as these 6500mah. The way I see it, if your Lipos can compete with the Thunder Power LiPo(Thunder Power Does not yet offer a 75c continuous Battery) I would rather go with the MaxAmps LiPo because I get a warranty. Whereas Thunder Powers warranty is not as flexible. For example- With a Thunder Power LiPo- for the first two years of ownership- we qualify for a 50% crash replacement. Which means we pay 1/2the new cost of the same battery. That is primarily for crash damaged batteries but Thunder Power can decide if they wish to allow a customer to have access to this crash replacement discount if it is determined by Thunder Power that the lipos were overdischarged or otherwise damaged by the owner of the lipos.

MaxAmps warranty- I've not read it in awhile but now comes standard with all lipos. It's a 3year 300cycle warranty and I believe within the first year it is a free replacement, and then a percentage added for use for the remaining two years depending upon how long the battery has been owned/used. MaxAmps has also lowered their prices allot- and removed there reduced price program which only gave the big spenders huge discounts. Now those discounts are applied to all the batteries. And I really like that move- great job MaxAmps- Well Done :)

Note: I recently purchased a 2500mah 2cell LiPo for my M11x and I asked Jason if he could make me one because at the time- they only offered the 3cell variety for the M11, whereas the newer model M11x takes a 2cell LiPo. Jason said no problem- he made the lipo and even add an additional wire for 5c quick charging- because MaxAmps uses the 5c quick charge cells for Transmitters as well. This means ten minute 12.5amp balanced charge times- and the LiPo only went up apx ten degrees from ambient/room temperature.

If these 6500mah MaxAmp LiPo's are competitive with the equivalent Thunder Power LiPo- the way I see it- the cool looking design on the MaxAmps batteries is just a plus. Most batteries have very little- if any design. And though the design on a battery has nothing to do with performance- I think MaxAmps is doing everything they can do- to satisfy the customer. And now that I think about it- I've never met anyone in person that has run or is running MaxAmps- that has anything bad to say about the batteries. And this is one of the reasons I highly recommend these batteries to my friends and family. Not one of us has ever had a problem that we feel MaxAmps didn't go out of their way to help us with. Even if it meant returning the battery within 30days for a full refund. That's MaxAmps. I don't know of any other battery supplier that offers anything near this kind of satisfaction guarantee.

I can also understand that paying allot of money for batteries is not possible for everyone. And for those of you that wish to pay very little for a LiPo- there is Hobby King with their Turnigy Line Of LiPo's- and many people run those and are very happy as well. Even though sometimes you will get a bad battery. The price is so low, it's still less to buy another one. I will also be giving the Turnigy cells a test this new race year as well. And I'll do a full review of the Turnigy cells vs the MaxAmp cells vs the Thunder Power cells. Thank You For Reading.

Originally Posted by brandonwilcox

Yes our 150C packs can handle the load. We have tested them at a higher amp draw then that.

Brandon

[suicideneil]

They arent 150C packs though, only 75C / 150C burst...

Still, holding nominal voltage at a mere 22C load isnt exactly great is it, I'd love to see what the voltage dips to with closer to a 40c load- I'd make these solid 30-35C packs at best, meaning they are overrated by about 120% ; nice marketing work but you cant fool us Maxamps!

[JERRY2KONE]

THE NUMBERS DO NOT LIE. Look none of us are asking for a graph that shows fair performance. What we are asking for is proof that shows that these cells hold up to the advertised claims of TRUE 150C rated race packs. From our understanding that means 150C continuous load capability all while holding nominal voltage. If this is not possible, then I would think that the reasonable and responsible thing to do is correct the advertising to match the actual ability of these packs. Otherwise it still shows that Maxamps is falsely advertising its batteries.

It was nice to have one of your biggest race supporters drop in to post a nice retort in support of your batteries and your company in general, but it still does not show that your TRUE 150C claims are in fact accurate. We can sit here all day long and write posts for or against Maxamps, but that will not prove or disprove your claim. We as your consumers want to see proof of your advertised claims for a battery that holds up a "true 150C" continuous load. Until you are willing to do just that all of this is a waste of our time and yours. So please stop with the song and dance and provide what you promised to do in the first place. This is not a bash on your company or anyone elses. We could care less about your reputation one way or another, but what we would like is for you to be honest and do whats right.

[Arct1k]

150C is burst not continuous.

[JERRY2KONE]

Originally Posted by Arct1k

150C is burst not continuous.

Can you provide the advertising that states that it is a burst rating? If that is the case, then there is the problem we are having with the advertising (TRUE 150C) race ready LiPos???? That does not read/sound like a burst rating. Plus from all of the conversation up to now there was nothing stated by Brandon that it was only a Burst rating either. This is what we are trying to get straight from the horses mouth. I do not think anyone cares to dispute with anyone else here. We just want some straight talk from Maxamps. Chris I appreciate you trying to support them, but we just want to hear the facts. specs on these batteries plain and simple. If 75C is the continuous rating, then how long will it hold voltage at 75C? And if that is the continuous rating then these packs are in fact TRUE 75C packs that will take 1 second busts up to 150C, not ture 150C. Are we all just not getting this, or is there something wrong with this whole marketing stradigy? I mean I am not a battery specialist or a rocket scientist, but why does this seem pretty simple to fix from our perspective but not from their end?

Maxamps: clear this up and post up the specs on these batteries. Please explain what you mean by "TRUE 150C race ready".

[MindThoughts]

This is an exact copy of one of Brandons post on this thread. Brandon said he will back this up with video and pictures of the test being performed. I'm looking forward to those results.

Originally Posted by brandonwilcox

Here is how we rate our cells.


*Please note this is a cell rating, as you know Deans and Traxxas connectors can only handle around 70 amps continious.

Our 150C Packs
150C - Maximum burst rating without swelling or damaging the cell. This is a 1 second burst.
100C - Maximum sustained burst rating without swelling or damaging the cell. This is a 10 second burst.
75C - This is the continious rating that the cell can handle through the full discharge without swelling or damaging the cell.

Have a good one.

Brandon