I have a 6 Inch LED Spot Mini Bar Light which is used for vehicles, it uses 12-24 V and is rated at 18 W of power. I have some 18650 batteries which would work perfectly for this project. What would be the best series and parallel configuration to power the light bar for maximum brightness I’m trying to get at least 4 hours of operation time for the light? I know I would need a BMS as well. Any help would be greatly appreciated!

Test I’ve conducted: I have been powering the light bar with different voltages and measuring the amperage drawn in order to see wether or not the light has some sort of current protection. When I applied 12.26 V to the light it drew 1.18 A, which came to a total of 14.46 W. I did this again with 16.33 volts and it drew 1.3 A which is 21.0657 W of power, which exceeds the 18 W power rating it has.

  • Does this mean I need to add some sort of current protection to the light as well?
  • Or does the fact that it has multi voltage input mean it has its own circuit board for current protection?
  • \$\begingroup\$ A battery pack 18V 5Ah would suit your demand. You can use a cordless drill battery pack + charger like from Makita, Dewalt, Ryobi,...then you'd need to make also a connector clamp for it. instructables.com/id/… \$\endgroup\$ – Marko Buršič May 22 '19 at 7:14

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