FWIW. the CMOS RAM/clock battery of this PC is not the (expnsive, hard to find) lithium thing that IBM used, but 4 AA alkaline primary cells in a holder with a couple of diodes in series. They last about 5 years, and they're trivial to obtain when I do need to replace them. However, a word of warning to anyone doing this. The series diode is, of course, essential to prevent any attempt to charge the primary cells. But a few machines -- the Torch XXX springs to mind, but thera are others -- use the NiCd as a crude shunt regulator to limit the voltage applied to the RTC/RAM chip. The NiCd is charged from, say, a 12V supply line, and if it's open-circuit, or missing (or of course replaced by primary cells with a series diode), the votlage applied to that chip will be essentially 12V, which will almost certainly ruin it. A Zener diode connected across the oriignal battery terminals (of a hight voltage than the primary cell pack, obviously, but low enough to limit the voltage when the machine is turned on) is a suitable hack for this. IIRC, My XXX has a 5.1V zener soldered across the original NiCd battery connections, and 3 AA primary cells in series with a Shottky diode as the backup battery. -tony