STEP 4 Screwdriver Screw problem

Hi, currently trying to replace my battery and I am stuck on Step 4. Noticed that when I started opening up my phone in steps 1-2, my phone had the standard pentalobe screw. Now in step 4, the screw is different. It is the + shape. I am assuming these screws are actually 2.5mm? If so, would I need the #000 screwdriver found here Phillips #000 Screwdriver ? I just wanted to make sure to avoid disappointment.

Thankyou.