Power down iMac for a few months....

I'm going to be doing some traveling without my 24-inch iMac.
It will be necessary for me to leave it unused for two or possibly three months.
I do not want to prematurely drain the little 3.6-volt Pram battery because it appears that with these new iMacs replacing this battery would require a trip to the nearest Apple Authorized service depot for complete dis-assembly and re-assembly of the computer.
Should I just unplug it or leave it on but asleep ?
M

Entirely up to you. If I were you, I would put it to sleep. If I remember correctly, the battery on the logic board that you speak of is only drained when the computer is off. If electricity is not an issue, I'd leave it on but in sleep mode. If you leave it off, you will drain the battery - How much, I'm not sure. I have had PC batteries in mother boards which have not been used for years test good, so again, not sure how much drain you're looking at.
If you decide to leave it on but sleeping, I highly recommend your Mac be hooked up to a UPS in case of any power failures.
Good luck.

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