Matador said:
Comparison applys to using cells a a givent load.
For a given load (in amps) power dense (High amps or high wattage) cells (aka lower internal resistance cells) generally have longer life because they heat less. But they pack less energy (Wh) density because much of the cell can volume is occupied by a bigger cathode (to allow for higher currents without turning iron red hot). Thus leaving less space for the lithium which give you the range.
For the same given load, more energy dense cells (with higher amp-hours) will have smaller cathode (suitable only for low currents), and more space for lithium within the cell. But that smaller cathode means higher resistance. So for the same given load, thr more energy dense cell will heat up more. Thus lithium chemistry will degrade much faster and cycle life will be LESS than for mor power dense cells.
You are right about the triangle between energy density (long range but limited power and if power rating exceeded, premature failure and lower cycle life), power density (high power cells are the standard for lightweight EVs,) and life cycle.
Also, it is utopic to believe you will ever get 3400 mAh out of a 3400 mAh low drain cell. Run it higher than 0.2C, and the real usable capacity will start to take a plunge. On the other hand, higher density cells will sag less and thus you will be able to extarct much more capacity until you reach the low voltage cutoff threashold of your controller and your BMS (around 3.0v per cell).
Matador
Matador, your explanation is over-simplistic as doesn´t involve numerous degradation modes of li-ion cells. Low temperature issues, parasitic chemical reactions, lithium loss, SEI layer build up , lithium plating, dendritic growth, …….
Here is one of numerous articles at highly recommended Electropaedia pages :
https://www.mpoweruk.com/life.htm
Warning : danger of the information overload !!!
And here another interesting file :
View attachment ALLPlus+ Technology.pdf
Regarding your concentration to internal resistance only, here is small comparison of DCIR at 3,8 V, 24 °C :
PF …. 34 miliohm
GA …. 36 – 37 miliohm
29E …. 31 miliohm
As you can see, the DCIR is similar.
Compare please GA versus PF voltage sag at the same load. Equipment : calibrated ZKETECH EBC A-10H, BF-2A fixture, 25 ±1 °C.
IMHO, your conclusions are erratic.
There is also problematic use of the battery in Dak77 case. Mode of intended use will be probably much more as electric scooter than ebike. That means enormous battery load, high DOD, ….. Therefore 13s8p battery cca 1,36 kWh (GA) or 1,1 kWh (PF) may not be enough for good lifetime. Moreover, we haven´t accurate information about real max and average currents.
So 13s10p or more could be more appropriate solution.