I'm looking for a way to power my Arduino Nano and a string of addressable LEDs using a small battery. I've used 12v packs running through a voltage regulator but I'm wondering if I can just use a 6v (technically 6.4v) battery pack instead? LiFePO4 has a native voltage per cell of 3.2v so one is too little and two is too much. How much is okay? I'm powering about 40 addressable WS2801 LEDs that also need 5v.