[dragontamer]

When in doubt, https://data.energizer.com/

For Lithium chemistry: https://data.energizer.com/pdfs/l91.pdf

That's Energizer's Lithium of course, but you can expect that competitors probably perform "similarly".

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You can see that Energizer Lithium is 1.7V, slightly more than the 1.5V found in typical Alkaline cells. Today's electronics are pretty flexible however, and this may not be an issue. (In practice, AA-devices are usually designed for 1.35V NiMH, 1.5V Alkaline, and 1.7V... but there are some devices that have made 1.5V assumptions and _ONLY_ work with Alkaline)

[tzs]

Oops. I meant 1.5 V rechargeable lithium AA batteries, but left out "rechargeable". I've edited my comment to fix this.

The 1.5 V rechargeable lithium batteries couple a rechargeable lithium cell with a buck converter to drop the voltage to 1.5 V.

I haven't seen any that are sophisticated enough to use a variable output buck converter and drop the voltage as the underlying battery discharges.