The closest I have is a HDS Clicky, that cuts off at a pretty low 3.2V running on high. Wondering if there are any lights truly safe to run on 18650s or RCR123s where you could leave them running on low without them taking the battery down too far. Like, ideally, cutoff at 3.6V or so.

Alternatively, lights that cutoff lower than that, but which at least have some sort of low battery indication enough so you could know to recharge before leaving it, say, overnight, unsupervised, on a low setting.

My LiIon lumens arent guilt free if Im always second-guessing how charged my battery is. Its kinda killing the joy of the MG P-Rocket and Quark RGB for me.