Hi, my friend just introduced me to this type of battery, he gave me one flashlight + 1 18650 + 1 charger. Man, I can describe my feeling with this, it is bright, it last a long long time, and especially the battery is rechargeable and it recharges fast! I collect AA/AAA/DD/DDD flashlights over the year, but this newest one is my favorite, and the big part of it is the battery.
My question, is, why 18650 battery is not popular, at least in flashlight? None of my local major stores carry any 18650 flashlights. Is it because of and hidden danger? Some down sides?
Thanks for any enlightenment.