How to replace the battery in Fox shock pump

Evening all.

I have a Fox shock pump like this: https://www.ebay.co.uk/itm/283470695598

Since I got my fork and shock sorted and then went away for a few months I haven’t used it and now it seems as though the battery has gone flat. Does anyone know how to open it up to replace the battery and what battery I will need? It has some teeny tiny torx screws on the back is that how to open it or is there some tool free way to remove cover?

I have read of a Fox shock pump that you cannot replace the batteries in; does it look different or the same?