This!! This is the weirdest thing I came across. A roommate of mine in college had a tablet, I forget what brand, but her tablet's pen required it's stand to charge and I was aghast. My little wacom from like 2005 has never ever EVER needed a charge. Just switch out the nib. So the fact that there's pens out there that need a charge and will die just horrifies me. That'd be my #1 thing when looking for a tablet - forget touchscreen BS and what not - if the pen dies while I'm drawing, it's a waste of my money.
(That said, my wacom is the tiniest size you can get, a 4x5 drawing size or something, super teeny. And when I got it, it was like 75$ on sale. Woo graphire!)