i see that mrc has a new 6s battery, Admiral Carbon 5100mAh 6S 22.2V 70C what I don't get is why they only went with 5100mah? ive been asking for 5500 or even a 6000mah would be better.
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Originally posted by axerhand1976 View Posti see that mrc has a new 6s battery, Admiral Carbon 5100mAh 6S 22.2V 70C what I don't get is why they only went with 5100mah? ive been asking for 5500 or even a 6000mah would be better.
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Originally posted by xviper View PostWould this "carbon" battery be a similar technology as other brands of "graphene"?
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I could be wrong but I'm about 99% sure there is not any battery on the market with any graphene in it. Instead they use carbon or graphite as the conductor because those materials have extremely low resistance. I don't think I'm giving away any secrets. Anyway, that is what we do and the Admiral Carbon will perform as well or better than any battery containing "graphene" and the Admiral Carbon has slightly less weight and stays slightly cooler. The discharge curve is very gradual compared to a normal LiPo which means you have nearly as much power at the end of the flight as you do in the beginning. For all intensive purposes, a normal LiPo will lose "C rating" as you discharge it during flight. With a normal LiPo, the first 10 seconds of your flight are when you have the most power. After that, you feel the power decrease as you get further into the flight. This is especially noticeable in an EDF. With the Admiral Carbon, the power decrease is so gradual, it is not noticed. The end of your flight feels nearly the same as the beginning. Just like a normal LiPo, you want to shoot for about 3.7V per cell at rest after the flight. personally I shoot for about 3.75 to be safe. Basically, treat it like a normal LiPo and you will be rewarded.
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I think that Tom's point is that the Company Which Must Not Be Named is using "Graphene" just as a marketing gimmick, its just a brand name.
It is misleading and makes the battery seem "high-tech" but the only graphene in it is the name on the plastic label. Which I suspected all along, because those batteries don't seem to be any different in terms of performance. I love my Admirals.
I have no idea if the high performance of this new 5100 is going to offset the considerable extra weight. For example two of them in my A-10 will increase the weight by half a pound! (248gms) And the plane does just fine with the original 5000's. I have also used RT6250's (35C) with very good results. So my twin 80 EDF obviously doesn't really need the high Cs and 5100mah isn't going to provide more than a few seconds of extra flight time.
So why do I need such a high C rating?
Well I suppose that the extra C's would be very important (and necessary) if you had a very high-current-draw model like a quad-80mm Vulcan bomber! Or a 6-engine B-36! Oh boy!!Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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How about this? My attempt at threadjacking :P
A Saunder's Roe Princess - the world's largest flying boat, with 10 turboprops (4 pairs with CR and two more for good measure)...
330,000 lbs gross weight.... 25,000 HP. Now, THAT would need a 70C battery!
Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Here is a little more explanation. Hope this makes sense. These Admiral Carbon packs have very low IR (internal resistance) which effectively raises the C rating. A carbon conductor is used to keep IR super low. Carbon has virtually no resistance (well, very little resistance). The benefit is a very slow and shallow discharge curve when looking at amperage output. A regular LiPo produces the highest C rating for the first 10 seconds. After that, the amperage a regular LiPo provides becomes less and less as the flight goes on. I’m sure all of you notice this is higher amperage planes. You can’t get the performance at the end of the flight you had in the beginning. The Admiral Carbon will give you nearly the same performance at the end of the flight as compared to the beginning. You do have to use a timer because you will not know when it is time to land by the battery performance. Eventually the Admiral Carbon becomes discharged and performance literally falls off a cliff as you hit LVC (and you never want to discharge this much with any LiPo battery as it will damage the battery). Here is my super crude drawing to illustrate the difference:
That said, performance comes at a cost. These packs are heavier and larger than a normal LiPo pack.
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Thanks Tom, that is a great explanation that I can understand. Higher-C packs are important for planes that have high amperage draws and this new pack looks like it will be great for that kind of purpose, and as you have illustrated it will be important to use a timer!Marc flies FW & FL: AL37, MiG-29, T45,F4, A4, A10, F104 70 and 90, P38, Dauntless SBD, Corsair, B17, B24, B26 & P61, Lipp.P19, ME262, Komets, Vampire, SeaVixen, FMS Tigercat, FOX Glider & Radian XL.
Rabid Models foamies, including my 8' B17 & 9' B36... and my Mud Ducks! www.rabidmodels.com
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Did you mean 1 oz. lighter instead of 1g?
The Turnigy HD 5000 is 838g: https://hobbyking.com/en_us/turnigy-...ack-xt-90.html
While the Admiral Carbon 5100 is 866g: https://www.motionrc.com/collections...-ec5-connector
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Originally posted by jtconte View PostDid you mean 1 oz. lighter instead of 1g?
The Turnigy HD 5000 is 838g: https://hobbyking.com/en_us/turnigy-...ack-xt-90.html
While the Admiral Carbon 5100 is 866g: https://www.motionrc.com/collections...-ec5-connector
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