Just when I was settled on the LD12, I saw an ad on this page for the Olight S15 Baton. It looks awesome!
If you are in for the Olight S15, I would say get the newer version, S15R, instead.
The S15R have nicer button that have never turned on in my pocket.
It came with a Li-Ion rechargeable battery (AA size) that can go very bright (~500 lumen).
Also recharging is easy with charging base.
You can also get an extension tube to use 2 AA battery, if you really want 2 AA.
The build quailty is really good.
I EDC it for a while in my side cargo pants pocket.
I have 2 complain about the S15R. the pocket clip can't really do bezel down carry, and the color tint is really green due to the XM-L2.
Hope this helps.