Hi, I'm a collector of vintage Macintosh computer: LC, LCII, LCIII, LC 580, PwrPC 7500, Classic II, PwrPC 6400, PwrBk Duo, Apple IIE, Newton 2100, SE/30, Apple IIgs, Plus 1mb, and some other stuff. Anyway, after many months of working on many Macs, I have found that these computers work wether or not the internal batteries are any good. I have in fact booted a computer with no battery at all. Everyone tells me that they are necessary for any operation of the computer whatsoever. Does anyone know if these batteries are really useful? Thanks.