2er Panasonic Industrial cell NCR18650B unprotected 3.7V Lithium-Ion battery 3400 mAh - Button Top (Electronics)
These 18650 batteries I am 100% satisfied !! By significantly raised Button Top good function in almost all devices is given (eg flashlights), which are intended for 18650 and the "stacking" of the battery is also possible without any problems.
