WooHoo Lipoly is now obsolete

[sjslhill]

throw away those short life LiPoly packs

http://www.radiocontrolzone.com/showthread.php?t=255708

MaxAmps.com brings you the exclusive “Green Series” LiFePo4 battery packs. These new “life” packs will not catch fire or explode with overcharge. In addition to being safer than LiPos, they are more robust. The new 4500mah 6.6V pack can be charged using our Hyperion line of chargers under the LiFePo4/A123 setting.

• Perfect fit in all standard rc car battery trays
• Same flat format as lipos(136mm x 45mm X 26mm)
• Low-maintenance and user-friendly
• Inherently safe technology
• Low voltage cutoff is not required
• 1000+ usable cycles
• 5 year 1000 cycle warranty available
• Environmentally friendly
• Water-sealed for all-weather protection
• Up to 60C discharge rating(1700+ surge watts)
• Up to 15C charge rate(67 amps)


LiPoly should be banned now that this technology is out.

I hope it's real....LOL

[JimClark]

Sounds good almost too good to be true though

[crabstick]

Nice! now we just need Zippy to make them

what ever happened to the LI-Manganese that were meant to make Lipos Obselete ?

[Raydee]

Max Amps should be called the Hype kings...LOL.
I really hope that they are on to something though, could be the perfect balance between power and safety.

[nate]

I take it no more BEC. Hmm, I want haha,

[nate]

Wonder what the next step up from 6.6v will be.. Won't two 6.6v Life's be slower in series than two 7.4v lipo's?....

[sjslhill]

Yes, 6.6v is slower....but they should not burn your house to the ground. I was being sarcastic on LiPoly going away.
Some will run them though, ones that are not in org. racing.

[sjslhill]

my thoughts

These are from China, I am sure Zippy aka Hobby City will have them soon enough.

Nice! now we just need Zippy to make them

what ever happened to the LI-Manganese that were meant to make Lipos Obselete ?

[domwilson]

Looks like they already do...http://www.hobbyking.com/hobbycity/s...ium_ion_30-60C

[Brushless55]

Those could be an issue when used on the UL-1 and escs that have a LVC built in..

[Ub Hauled]

Looks like they already do...http://www.hobbyking.com/hobbycity/s...ium_ion_30-60C

These cells have been around for a long time... before they merged with Enerland...

[Himalaya]

No graph no truth.

We need V-I graph data, not English words that anybody can say.

Genuine A123 is known poor at voltage holding capability under load. its datasheet tells it all. And the A123 is still the best among all LiFe cells.

Don't get fooled by LiFe's scary C ratings, it's just to say they may survice under that discharge, no matter how much voltage retained.

[AntronX]

LiPoly should be banned now that this technology is out.

Whoa! Not so fast, dude.

Every time new cell chemistry comes out, first thing I do is figure out it's energy density. Currently, Lithium Iron Phosphate batteries have much lower energy density per unit of weight compared to regular Lithium Polymer batteries. No big deal for cars, but big deal for boats and planes. From my rough calculations:

MaxAmps 2S2P 6500 mAh 7.4V LiPo = (1 / 0.327Kg) * 7.4V * 6.5Ah = 147 Wh/Kg
MaxAmps 2S2P 4500 mAh 6.6V LiFePo4 = (1 / 0.32Kg) * 6.6V * 4.5Ah = 93 Wh/Kg

So, starting off with brand new LiFe pack is like using old and abused LiPo pack at 63% of it's original energy storage capacity. In other words, if my boat had 6 pounds of LiPo, then I will need 9.5 pounds of LiFe battery to match the run time. Pretty big deal to me, that's why i went away from A123 cells to LiPo for my boat. The change in runtime and handling was amazing.

[sjslhill]

yes I know

Chill dude, I was not being serious...LiPoly will be around until someone's child burns up in a fire...don't worry, it has not happened yet.

Whoa! Not so fast, dude.

Every time new cell chemistry comes out, first thing I do is figure out it's energy density. Currently, Lithium Iron Phosphate batteries have much lower energy density per unit of weight compared to regular Lithium Polymer batteries. No big deal for cars, but big deal for boats and planes. From my rough calculations:

MaxAmps 2S2P 6500 mAh 7.4V LiPo = (1 / 0.327Kg) * 7.4V * 6.5Ah = 147 Wh/Kg
MaxAmps 2S2P 4500 mAh 6.6V LiFePo4 = (1 / 0.32Kg) * 6.6V * 4.5Ah = 93 Wh/Kg

So, starting off with brand new LiFe pack is like using old and abused LiPo pack at 63% of it's original energy storage capacity. In other words, if my boat had 6 pounds of LiPo, then I will need 9.5 pounds of LiFe battery to match the run time. Pretty big deal to me, that's why i went away from A123 cells to LiPo for my boat. The change in runtime and handling was amazing.

[sjslhill]

it's a start though

true, but it's a start.

No graph no truth.

We need V-I graph data, not English words that anybody can say.

Genuine A123 is known poor at voltage holding capability under load. its datasheet tells it all. And the A123 is still the best among all LiFe cells.

Don't get fooled by LiFe's scary C ratings, it's just to say they may survice under that discharge, no matter how much voltage retained.