I read that someone on the board runs their TK11 with a TK10 head, so I tried it and I like the set up. My question is can I safely use a 18650 battery with this light ?
My AW 17670 3.7V 1600 mah flickers on high, not low, fresh off the charger in my TK10. This battery is slightly smaller with a little less capacity than the 18650 but has the same voltage.