With the right charger and a protected cell, an 18650 can be safer than a alkaline
+2 although I m not concerned about the unprotected batteries, I actually prefer them as they actually use more stable chemistry and protection is not needed. I strongly point out however that I ALWAYS get my batteries from authorized dealers and do not touch counterfeits. This goes for any kind of phone chargers, cables, lithium batteries, etc. and I don’t buy these off of eBay or amazon as then it becomes risky.