What effect does switching frequency of voltage converter have on my project?

[TomGeorge]

Hi,
I think for Li ion battery with 3.6V nominal terminal voltage should not be discharged below 3.0V

Li-Ion & LiPoly Batteries

So your minimum voltage with 3 cells = 3 * 3.0 = 9V not 7.6V

So you have a charge/discharge control circuit?

Tom...