Dell used to offer dual battery bays in its business line like the Latitude C840: https://youtu.be/9XkeTCIC1TA?t=453 https://youtu.be/9XkeTCIC1TA?t=453 Side n

Dell used to offer dual battery bays in its business line like the Latitude C840: https://youtu.be/9XkeTCIC1TA?t=453 https://youtu.be/9XkeTCIC1TA?t=453 Side note: The clips holding in the batteries were the number one failure mode on those laptops.