I prefer protected batts.. Nice extra layer of protection.. search Youtube for what a lithium battery does when it becomes shorted or unstable.. That will help you decide... If you think a Li battery is getting hot, toss it out the window FAST.. Try not to hit a car or ped.. These batts are serious bombs waiting to happen under the correct circumstances. They're in our phones too... Not a problem if used/applied in relatively safe manners. Using unprotected batts is a choice and sometimes a requirement with certain devices for the 'device' to function as designed.... I have one... a Provari... But, I also use protected batts sometimes in my provari with very few issues. But, nuisance trips are a part of it...
Its all a choice. Make it an informed choice. Make sure YOU are properly informed and know what is going on with your choices, otherwise, you shouldn't be using them (Li batteries).