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Old 06-28-2012, 06:41 PM   #1
brandonwilcox
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Thumbs up MaxAmps.com 8000mah Dual Core 150C LiPo battery packs



Spokane, WA The 150C Dual Core pack offers the highest performance of any LiPo battery available in the world. Rather than using one 8000mah cell, we take two 4000mah 150C cells and put them together in parallel. By doing this, the power load is split between two cells (cores) instead of one. Each cell has the thickest and lowest resistance tabs available. Not only do you get two cores, but you get 4 tabs instead of 2. This creates a pack with the lowest possible resistance, the highest voltage under load, and the most rapid voltage recovery of any pack we have ever tested.


http://www.maxamps.com/products.php?cat=329


  • 50+mph in most brushless setups (7.4 volts)
  • True 150C rating
  • 48 minutes average run time (8000mah capacity)
  • Lifetime Warranty
  • 5C fast charge capable
  • 100% waterproof
  • Built today with factory fresh cells
  • Built with genuine 12awg Deans Ultra wire
  • We add the connectors and balancing taps for you
  • 137mm x 45mm x 33mm, 441g
About MaxAmps.com
MaxAmps.com is the industry leader for high-quality LiPo batteries for air, water and surface RC products. Their packs are made to order same day and are assembled in the USA. LiPo packs come 100% waterproof and include a lifetime warranty at no additional charge. For more information on MaxAmps.com, please visit http://www.maxamps.com or call 888-654-4450.
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Old 06-28-2012, 07:45 PM   #2
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hope you dont mind a question or two..

150c on an 8000mAh battery means it is rated for 150 x 8000/1000 = 1200A

1200a is a whole lot of current, more in fact than flows through a typical overhead power line.. and those cables are about as thick as your wrist.

On the subject of cables.. The specification implies that the battery is rated for 1200A, yet it uses 12AWG wire.. 12AWG silicon wire is rated for about 55-60A, maybe a little more in short bursts.. so how do you get 1200A though it

And I'm really having a hard time believing that you really can pull 1200A out of that battery even if you used massive wire.. got and testing data?

Steve
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Old 06-28-2012, 07:54 PM   #3
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I agree... deans are only rated for 100amps continuous. I have pulled a bit over 60 amps through two 1800mah, but there each rated at 30c..., or 54 continous, and 108 peak. I coud only pull about 45amps each on a single battery, but the voltage wouls sag quite a bit.
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Old 06-28-2012, 08:37 PM   #4
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That number is a maximum burst rating of the cell. There is no connector on the market that can handle much over 100 amps. We do recommend 6.5mm bullets in heavy 1/8-scale vehicles and larger jets as they can handle a little more.

Thanks,

Brandon
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Old 07-07-2012, 01:15 PM   #5
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Here's what HALF that current does to a 4" nail.


I wouldn't want that to happen in my plane.

Also, I can't help but wondering what kind of motor you would pair that battery with. Not to mention what ESC to use...

AMA #959089
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Old 07-08-2012, 01:55 AM   #6
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You would use the motor for your plane, and the speed control for the motor. Unless your pulling over 1200amps, I think the battery will be okay .
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Old 07-08-2012, 03:29 AM   #7
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Originally Posted by brandonwilcox View Post










Spokane, WA – The 150C Dual Core pack offers the highest performance of any LiPo battery available in the world. Rather than using one 8000mah cell, we take two 4000mah 150C cells and put them together in parallel. By doing this, the power load is split between two cells (cores) instead of one. Each cell has the thickest and lowest resistance tabs available. Not only do you get two cores, but you get 4 tabs instead of 2. This creates a pack with the lowest possible resistance, the highest voltage under load, and the most rapid voltage recovery of any pack we have ever tested.


http://www.maxamps.com/products.php?cat=329


  • 50+mph in most brushless setups (7.4 volts)
  • True 150C rating
  • 48 minutes average run time (8000mah capacity)
  • Lifetime Warranty
  • 5C fast charge capable
  • 100% waterproof
  • Built today with factory fresh cells
  • Built with genuine 12awg Deans Ultra wire
  • We add the connectors and balancing taps for you
  • 137mm x 45mm x 33mm, 441g
About MaxAmps.com
MaxAmps.com is the industry leader for high-quality LiPo batteries for air, water and surface RC products. Their packs are made to order same day and are assembled in the USA. LiPo packs come 100% waterproof and include a lifetime warranty at no additional charge. For more information on MaxAmps.com, please visit http://www.maxamps.com or call 888-654-4450.
OK
1200 Amps on #12 Wire? The fusing current (that is the current where the copper wire MELTS!) for #12 wire is 235 Amps.

What is the internal resistance of those 150C cells? Have these cells actually been tested at 1200 Amps? The resistance of #12 copper wire is 0.0018 ohms per foot, so 1200 Amps represents about a two volt drop in the wire between the battery and the ESC. Two volts and 1200 Amps is 2400 watts in the #12 wire.

I've done a bit of work with these very high currents before retiring. (OK a LOT of work with this stuff.) We worked with 500 and 1000 Amp test currents, up to over 10,000 Amps on a daily basis. These test currents were applied to high voltage 27KV circuit breakers during factory testing. The source voltage for that 10,000 amps was 400 Volts AC. The power transformer for it was specially wound by one of the companies other divisions. The primary of that transformer is 24.9KV, and we had to arrange special circuit breaker coordination to the nearest electric company substation, so our tests would not trip out the power substation. We had a half dozen of those very high current test cells that also had up to 38KV three phase power present inside them.

Please view the attached file for a look at wire we used that was rated at 950 Amps continuous. This wire weighs in at 2.1 pounds per foot of length.


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Old 07-08-2012, 03:42 AM   #8
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Originally Posted by brandonwilcox View Post
That number is a maximum burst rating of the cell. There is no connector on the market that can handle much over 100 amps. We do recommend 6.5mm bullets in heavy 1/8-scale vehicles and larger jets as they can handle a little more.

Thanks,

Brandon
The Anderson Power Pole connectors next size larger connector can handle several hundred amperes. They are rated for #4 copper wire. We used a lot of them at work.

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Old 07-08-2012, 04:15 AM   #9
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I think he ment for models. A car battery connector is good for more then 600 amps.
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Old 07-08-2012, 05:05 AM   #10
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According to the "true C" equation solved for IR, the internal resistance for this battery would have to be around 0.33mOhm. That's an EXTREMELY low number!

Conclusion: I'm sure these are excellent batteries, but it's better to market them without outrageous claims that aren't based on any published tests.

Show me a video where you're running 1200A through the batteries without fireworks going off, and I'll take it all back and you'll have my most sincere apologies.

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Old 07-08-2012, 05:38 AM   #11
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Originally Posted by hayofstacks View Post
I think he ment for models. A car battery connector is good for more then 600 amps.
Yup
Here you go. These connectors are identical to the Anderson Power Pole connectors, but are double the size in length, width and height.

http://www.powerwerx.com/anderson-po...k-120-amp.html

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Old 07-08-2012, 05:47 AM   #12
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Originally Posted by NJSwede View Post
According to the "true C" equation solved for IR, the internal resistance for this battery would have to be around 0.33mOhm. That's an EXTREMELY low number!
0.33 mOhms. That's 330 Micro Ohms. Or about the bushing to bushing resistance of one of 300 Amp 24,000 volt vacuum circuit breakers that the company I worked for manufactured. The contacts of those breakers are wired with about 4/0 copper wire.

When you are working with 1200 amperes in very closely associated wires, the magnetic forces between those wires becomes substantial. Enough to tear the wires loose.

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Old 07-08-2012, 05:29 PM   #13
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And all I was looking for was a 2s 7.4v 1300mah 20c JST.....LMAO....

"50+mph in most brushless setups (7.4 volts)"........

What the heck does 50mph and "48 minutes average run time (8000mah capacity)" have to do with the rated battery power output...? I thought speed and run time were products of other various factors like prop size, motor output, gear ratios, environmental conditions, and last but not least.......flying styles and craft design.......I'm completely confused by this advertisement......maybe they got the weight and physical properties twisted too....lol
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Old 07-08-2012, 08:01 PM   #14
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Where its 7.4v's and way overly hyped and a rediculously large mah rating, its going to be for a car. They don't care much for weight, just flight times. A lot of cars still run brushed motors.

*edit*
Damn it, ment drive times...
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