Breast pump suggestions?

I’m gonna be a first time mama and can honestly say i know nothing about breast feeding... besides I want to do it lol

I’ve narrowed down the breast pump options through my insurance to either Spectra S1 or Spectra S2. The only difference is the S1 has a battery pack, so it’s $95... vs the S2 which has just a wall plug but is free.

Is it worth it to get the battery pack option? Has anyone tried this brand and not liked it? Any other recommendations?

Also, how much should i anticipate needing to pump?

My entire family bottle fed by choice so this is all new to me!

Thank you 😊