Are you able to load the batteries from the head end of the Fenix TK16 (V1) flashlight?

No, the head of the Fenix TK16 (V1) flashlight will not unscrew. Please don't attempt to unscrew it as this will void the warranty. The head of the Fenix TK15UE is able to unscrew and you can load the batteries in through the front with this flashlight. 

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