Hi guys, just thinking of starting this project, I have two 6000k H1 lamp and ballast not being used and thinking of modding it (just for fun) to be fitted on my mtb. I'm wondering what kind of power source should I consider, a car battery is definitely out because of the size, I'm wondering if 4x 18650 would be able to run it. Tried 4 x 16340 and it didn't work. The bulb and ballast are tested to work with my spare 12v car battery. Also, they're 35W.