I read a lot of people using this battery http://www.ebay.com.au/itm/111196510869?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649 to run their LED.
DONT USE IT.
This battery is not for operating the LED. Its a normaly mobilephone battery ( existing of 9 small batteries)
The energie the LED needs to run, is not high eneough (discharge energie).
When LED takes to much Energie, the protective circuit release and battery cant used anymore.
So please use LiPo battery.
Next update will be a ultra low noise fan (19 dB or less) and batterycontroll. The batterycontroll is relevant to stepup converter. that means the electric circuit of the batt.controll will be added to the el.circuit of the step up converter.