also, +1

In my opinion, none of these should be above 50/s regen, no matter what. Power cells should have higher caps and lower regen rates, to discourage energy spam and make people actually use their turbo strategically while still providing greater rewards for correct use of energy.

more variety is good to me

Since Nahin is playing necromancer today, +1 to more powercell variety.

Why not introduce another factor of cells called "Turbo Energy Regen" and "Non-turbo Regen"
So the cell regenerated differently depending on whether you are turboing or not.
This would split the current "Regeneration" that we have.

Actually I suggested that the cells be broken into genset and storage as two separate components some time ago...