@Madhoo ji yes you can charge your ec with serums and energy but it should be of same healing aspect or for same use.
For example if your wish is for finance then you can charge EC with Total wealth serum or Healing energies of mahalaxmi.
And for any health issue perfect health serum (or serum related to specific wish) or mahamrityunjay mantra energy.
Note: please don't write serums name in an EC.