I know this is old news but since I’d not known and I did mention using them I thought I’d post a link to a comprehensive list of head torches that Petzl don’t recommend for use with lithium batteries, as well as some that they do.
Apparently the lithium cells can overheat the torch and even burn out the LEDs.
However we’ve been using them for some time with two Tikka Plusses. The Tikkas aren’t this year’s model which has the 80% brighter LEDs but I’m not sure that would make any difference.
I’m a bit busy with many other things at the moment but still wondering what Sicily’s like…