As those 25500 batteries are no longer available, I chose the FM09 instead and built a WA1174 (7.2V / 2.77A) bulb in it. Add two 26650 batteries and you are set! Switch it on... and have a LOT of warm, nice incan-light! I really like this light. It's slim and not at all too long or too heavy. With those monsters of 5500mAh batteries, I nearly can have two hours of runtime. Now THAT is nice!!
