A:Answer 90Wh - fairly large as the largest you can legally bring on a plane is 99.9Wh. By expansion slots, what do you mean? Specs say you can add an additional m.2 SSD, but RAM is 1/2 open and 2/2 soldered, there's USB-C as TB and multiple USB A ports. If you're looking for a PCMCIA expansion slot, those are long gone.
