Be really careful with the step after this. Do not commence until you have read all the comments. You need to get a good hold of the plastic strips preferably before they double over on themselves. You have to avoid puncturing the battery at all costs. Slowness and caution here will save you a lot of long term pain.
I don’t recommend using the spudger for this as you can do more damage that way. I scratched the black square thing underneath.