Hi lidas. You can use taskled hbflex or hboost driver. I am using hbflex with 5 x 26650 li-ion batteries in series with the driver set at 2 Amps. I also tried it with hboost and a 50k logarithmic potentiometer which allows stepless dimming. With these drivers , you need a battery bigger than 14,8 volts as they are built to work at max 7 or 8 Amps input current. Together with taskled hallsw which can be controlled with a magnet, you can have a nice setup.