Take multiple pictures of your existing cell layout as you will need to recreate it exactly. (Now updated with two pictures from my other wheel battery rebuild without the clipped tab)

Pry off the old tabs (only if you know what you're doing. The risk of fire and explosion if you do not is very high. It's fully possible to learn but this guide is not where to do it.)

Unscrew the two security screws (circled). Place battery upside down. There are holes in the back of the pack you can poke a blunt tool into to help push the rubber cell holder but only push on the ones with white rubber visible. A preferable option is using a spring hook to lift under those circled areas and lift a little each side at a time.

Eventually you'll be able to remove the white cell holder.