I need some advice. I am looking to move my single cell Haiku to rechargeable fuel and I do not want to fry it. I believe that the range is 500mAh to 750mAh from what I have read on the boards for my 219v Nichia. I have considered the EagleTac 16340 RCR123A RCR123 750mAh Protected, but I would like some advice before purchasing a few cells. Additionally, I am concerned about the fit as I have been burned there before. Thoughts?