Looks like on the grey connector, in the middle is the catch, the little black part. Try a flat head to the left and pry up the grey bit that’s over the catch nipple. Careful whenever dealing with nipples.
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Good ol' Nissan and their hard to remove connectors! You need to press on the black part on that gray tab, or GENTLY pry up on the gray tab to get it over the black part.
The connection to the battery is pristine and silver AF
Looking at the post on the bottom right of the picture, you've still got some cleaning to do. All those connections also need to be clean and shiny (and don't forget grounds!). I'm fairly sure a current sensor won't cause a no-start. You likely have a poor connection somewhere or failing starter if it's intermittent.
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