I've got a plus that's running well and maintaining time/date (with power off overnight) with a AA alkaline battery in the holder. Anyone else try this?

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It seems to work (for at least some time, anyway) in many Pluses. That's a testament to the large design margins in the clock circuitry, but I wouldn't count on it for a long-term replacement. But it can work (as you've found out), and it's certainly cheap!

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Well that's interesting to know. If a single AA cell will work, then this battery from Frys http://shop4.outpost.com/product/2977135?site=sr:SEARCH:MAIN_RSLT_PG for $6.99 should work because it puts out 3.6V. I bought one at the local Frys for $5.99 (but haven't tested it yet), so that's considerably cheaper and more convenient than mail ordering a perfect replacement for $7.99 and paying shipping too. Of course, that only helps folks with a local Frys.

I also found the this http://batterystore.com/Eveready/A21PX.htm for $7.99 which looks like the same battery which Radio Shack sells.