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> My favorite non-rechargable AAs are Li-FeS2

Lithium Iron Disulfide. For those looking for a brand name, that's what these are:

https://energizer.com/batteries/energizer-ultimate-lithium-b...

I just worry that the voltage of these is a bit too high, if the device takes 3 or 4 in series. They tend to be around 1.8 volts per cell, significantly higher than a fresh alkaline AA at around 1.6 volts, and even after half the energy is discharged, if the device is off for a long while, the initial voltage for next turn-on creeps all the way back up.

(The price doesn't bother me ... it's worth the much lower chance of leaking than alkaline, if you leave it in a remote or gadget for years. But I've come to think that rechargeable NiMH like eneloops are a better idea due to the voltage.)

I can't think of too many places I'd use Li-FeS2 other than maybe in smoke alarms. They're available in 9-volt form factor. I use NiMH or Li-ion pretty much everywhere else these days.

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