Would you still need to charge a spirit's vessel if they feed off of your and other's energy?

I'm quite sure they don't feed of anyones energy but of energy flowing around and earth energy.no idea about vamps though. Charging is always good idea. When you have several spirits its a good thing to get an aeon orb.

Charging is for the spell bind, not for the spirit, so if you have spirit feed on energy, you still have to charge the vessel.

Spirits do not feed on your personal energies, I even have a vampire and he never feeds on my energy and all of my spirits are body bound to me so I would know. They actually infuse you with the excess energy they acquire. For vessels however it is necessary to recharge them, put the vessel where it can absorb the energy of the full moon or you can always light a white candle and burn some incense which will also recharge the vessel. There are charging stones and boxes that will charge them as well. As humans, we need food to be fueled up, spirits need earthen energy.