I recently got the k100.I noticed something weird when charging the 18650 battery.well close to the end of the charge the lights on the battery charger went from red to an orange color before eventually turning green what does the orange light mean since I didn't get a user's manual with the kit thanks kamry! also I'd like to ask if anyone can explain this to me in layman's terms what is a good battery of the 18 650 size I've heard there are ones out there that give you a better throat hits and deliver a bit more power but I want a safe battery since I don't know what I'm doing yet.