The new and improved grip cheek assembly provides easy and tool less access to the inside of the grip frame including the battery.  You can now remove and install a battery without a tool whenever needed.  Press in on the grip pin.  This opens up the left side fo the Grip Cheek enough for you to grab hold of it.  Gently pull until the entire left side of the Grip Cheek opens to allow battery access.  Line up the button heads with the grip mounting holes and push in on the left side Grip Cheek to close it.

Note: This will NOT, by itself as an upgrade, provide tool less entry to your standard Crossover.