I've found..
"If using the In Seat Power Supply (ISPS), which applies to our Upper Class® and Premium Economy cabins, the laptop battery must be removed before connection to the seat is made. While the battery is removed, it should be placed into a plastic or airsickness bag to protect the battery terminals from touching any metal surface."
I've found..
"If using the In Seat Power Supply (ISPS), which applies to our Upper Class® and Premium Economy cabins, the laptop battery must be removed before connection to the seat is made. While the battery is removed, it should be placed into a plastic or airsickness bag to protect the battery terminals from touching any metal surface."
And in answer to the OP, assuming you do have in-seat power then yes it works fine. I've tried this on seats in Virgin's Upper Class and Premium Economy cabins and never had an issue. I've never been asked to remove my battery either (MBP).