Hmm.... Every 23 I've seen is, at least as far as I can remember. But they are made of 8 stacked 1.5v mini coin cells, so you could do an alkaline. At least I think the energizer ones I mine for the LR44s are lithium.... Hmmm... I'll have to check.

I thought they were lithium.
_________________________
-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.