Congrats on your new K1 ll.
I have large hands and the bodies on my K1,K5 and K10D were too small for my XL hands. I find the grip on the K-1 works well for me. More surface areas for me to grab onto.
. I also carry an extra charged battery in the grip, but ensure that I specify body battery, rather than use the default battery selection setting on the menu and end up with both batteries running out at the same time. Voice of experience.
I also have a K5 (with battery grip) and just take one charger for both cameras when I'm on a trip. I checked both K5 and K1 manuals and found out they use the same batteries and charger.
Ahhh...you're going to have fun...