Don’t know of a driver for AA & li-ion with modes.
For li-ion only there are oshpark drivers.
~ Edit ~
Oh, hey! The coil!
The second picture didn’t load right till now.
I can wiggle the coil a little bit. But it’s connected at both ends. I don’t know what’s up with the red goop. If you click on the pic you can get a better look at it.
The coil’s wire has broken off the board.
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The red goop is adhesive to lock the coils in place and reduce audible whine.
Just a bad picture I’m afraid.
Heat may be melting the wax off the coil? Is that a possibility.
I think that it’s hard to diagnose what the problem may be without being able to see both sides of both of the driver boards. And, even then, it may not be possible as the damage may be internal to some component.
So, at the least, what I would do is de-solder the leads at the emitter so that the driver boards could be separated from the pill, and then see how they’re connected and possibly separate them to inspect them.
I would be curious as to the microcontroller on the board to see if it can be reprogrammed giving a moonlight mode.