Turnigy LiFEPO4 packs

[sikeston34m]

It's probably time for me to buy a data logger.

I have some of the 2S2P packs on their way and should be here the first part of next week.

Many of the questions you guys are pondering, I've been asking myself too.

I've ran A123 packs before and wasn't really impressed with them, due to the extreme voltage drop under a load. Lipos are famous for holding the voltage high during discharge.

I wonder if the flat poly form of the Lifepo4 will hold loaded voltage better than the cylindrical form?

In comparing the cylindrical form to the flat form, won't surface area of the anode and cathode material have a big impact on performance?

It stands to reason the flat form should be superior.

I will do side by side run tests to compare the 4S Lifepo4 to 4S Lipo.

4S 30C 5000mah Turnigy Lipo versus 4S 30C 4500mah Turnigy Lifepo4

My testing will be done with an E Revo.

MMM ESC and a Medusa 36-60-1500kv geared 22/40 using Mod 1 gears.

I want to see the differences in performance with no changes to the setup.

Then I want to alter gearing to compensate for the greater voltage drop of the Lifepo4 cells. I may even swap the 1500kv motor out for a 36-60-2000kv version.

I can either change the gearing, change the kv of the motor, or both to make up the difference.

[Thomas]

Originally Posted by sikeston34m

... In comparing the cylindrical form to the flat form, won't surface area of the anode and cathode material have a big impact on performance? ...

As far as I know, all batteries are just thin films stacked, no matter if they're arranged in a cylindrical or a prismatic case or just wrapped in aluminium foil. But of course, the one with a hard shell will be heavier for the same performance.