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#21
Yes, if you switch off the mains power most of the time then the battery is only expected to last ~3 years in the ideal case. 2V is Intel's requirement measured at the PCH. If the motherboard has other things connected to VccRTC and/or if the motherboard manufacturer used a cheap diode then there would be additional voltage losses between the battery and the PCH so the required voltage at the battery would be higher.