No, the ones I opened were all drained.
At this point, I'm sure I could do it... At the time, I was young, and my knife was sharp, soon as it cut through the lighter, there was my thumb, bone and all....
And I do have a project, on my long list, that will involve gutting a Bic lighter...
To get back on topic: Any more you wanna share? I'm interested; What kinda switch did you use?, You said you're using 2x 10440's, are they serial or parallel? If serial, did you use a regulator, or are you running a full 7.4V (8.4V with full charge)?
Or if you wanna keep it under your hat, so there aren't a bunch of imitations running around, I understand...