Hi,
Very happy with the FT03, Ive tried 18650 LGHG2, Sanyo 18650 GA and 18650 Samsung 30Q, I have also tried 26650 Xtar 4000mah black, all seem to work similar to the eye but the 18650 soon start to drop in voltage after about 10 mins, would it be worth investing in another cell or would I not notice and throw/brightness to the eye. Link to Xtar review below