18250 battery?

Any suggestions, esp. for a driver? I’d really like to be able to squeeze a tiny boost driver with some modes in there!

Edit: Another thought: I’m wondering if 3 x LifePO4 10440s in the carrier might work, DD. They’re nominally 3.2V, so 3, would be like 9.6V, which would be just a little high for the 3up emitter. I just ordered a set of 4 from FT, we’ll see how that goes.

Still not sure how to secure the Carclo, but I’ll how that goes when they come in.