I'm trying to understand the pros and cons of various kinds of flashlight configurations.<br><br>How does a person know if he/she can place lithium batteries inside a particular kind of flashlight? Can I use lithium inside of a mini-maglite? Inside of my Petzel headlamp?<br><br>What is the advantage of lithium? Do they cause a flashlight to illuminate brighter, longer, or both?<br><br>Thank you very much for all responses.<br>