And if it ran 6S like it's supposed to.

Not everyone is having trouble with it on 6s, but yes, still it should be able to do 6s LiPo without issue no matter what.

yes, I guess that too...

ZPB: Who isn't having trouble with the Quark on 6s? AFAIK, everyone has reported issues. The only time it seems to work is if you let the pack discharge a little so it's not at exactly 4.2v/cell.

I wonder what the result would be if you set the charging CC/CV threshold to something like 4.1v/cell or 4.15v/cell? Anyone want to donate a 6s pack for me to try? :)

Really, I thought not everyone was having issues?

I wonder how 7s A123 pack would do? Same 25.2 volts at fully charged. However, you CAN use a 3.45 volts to charge, I think you get about 95% charge, and takes a little longer (3.45 float charge voltage), so that's 24.15 right off charger. But as soon as you discharge a little bit out of an A123, the voltage goes down to operating nom. volts instantly. I bet a 7s A123 might work fine.

It's basically a problem of discharge curve, and voltage droop of batts. If batteries had a very good discharge curve (like A123, or better) and very little droop, you would need less cells to get the working voltage. It's better for everything really...

Altair Nano cells are going to be 2.4 volts/cell, which is nice, gives you more voltage options. They also would last a lifetime, LITERALLY, they have put 10's thousands of discharge cycles on them at 10C discharge/10C charge, they retain over 85% capacity still at that point (16,000 was the latest figure)

Nice info, Brian!

At what freq. ESC running do you know? Also, is it difficult to measure or identify series resistor (in FET's gate) value? I think I have a clue why both of them have problems at higher voltages.

Meanwhile looks good on paper, but input capacitance a little bit high.

Why would input capacitance on an esc be too high? The more the better...

Do you mean esc caps?

He means the capacitance of the FETs.

Yups..

Oh, does that lengthen the slew state? Seems to me it would?

No, I don't know the resistor value nor the frequency. As it is, I could barely make out the number because just the top of the FET was peeking out. Judging by the compact cluster of FETs on the power board and the number of connections between the two boards, the gate resistors are probably on the "brains" board - and there's no way I was gonna risk a brand new ESC by unsoldering the two PCBs apart - especially since they are multi-layer PCBs. :) It would be nice though if someone did and took some very hi-res pics of all sides of all PCBs. Maybe someone who has a bunch of these things and one or two are questionable anyway *cough*glassdoctor*cough* ?

I just thought it was quite interesting to note that the Quark and the MM use the same FETs. So, any "issue" specific to one ESC is solely due to programming, and possibly a choice in support components.

Since it appears you will tear it apart and look anyway maybe I should tell you what our fet is? I think the spec sheet will impress you. Far better than what you are looking at currently for large scale applications.

Who would have thunk the monster guys were this techy...We have pro drivers that do not really even know what a fet is, or care as long as when they squeaze it it rips.

Tekin Prez

LOL, yeah, we'll rip things apart - as long as it doesn't damage the ESC of course. Hate wasting money that way. :)

I'd be happy to know the FET component number. It would save the need to tear it apart. :)

Some of us are techy, some just want to plug it in and go. There's quite a mix here.

I have heard that the newer MambaMaxes have a different FET... but I have an older one I could get some pics of... but then maybe CC would think I'm nuts and won't fix it them for free anymore. :D

Steve at radiocontrolzone.com has had the heatsink off the MM and even replaced all the FETs he damaged in the process.... maybe he has more info. He also moded the BEC circuit with 6v Novak components.

Prez.... you know, some of us would make great beta testers. And some of us can hang with your team drivers on the track too. ;)

GD: Yeah, I'd be curious to know the older FET number if you can manage it...

The MM I have is very new, so it probably has the newer FET.

Good point there buddy! So I guess it will go in order of status, right? As in Mods first. :)