Slightly Confused By 18650 Batteries
I recently purchased these batteries:
And this charger:
For use in this flashlight:
I got the batteries and chargers today and am slightly confused. This is my first set of non-AA, AAA, D batteries... I'm used to batteries having the little protruding part on the positive (or is it negative? Whatever...) end -- these clearly do not. When I put the batteries in the charger, the LEDs on the charger show green, but if I twist the batteries around a bit, they flash red. How do I know if the batteries are making contact with the charger properly?
Someone please help a clearly electronically challenged newb.
Thanks in advance!