I had a number of the IIIxe in the late-middle days of Palm. They were a little fragile and tended to get busted up. I had one whose switch-mode supply hummed

I had a number of the IIIxe in the late-middle days of Palm. They were a little fragile and tended to get busted up. I had one whose switch-mode supply hummed audibly- that one ate batteries. Maybe you had better hearing than me or worse luck.