Do I need a buck converter for 6V from 4 AA batteries to PB/LEDs?

I’m looking for alternatives in case I can’t recharge my battery. Can I plug in 6V via 4 AA batteries in with the LED’s (not via micro-usb), or do I need a buck converter? From my research it seems like it may work on the LED side but may shorten the lifespan. How about PB?

PB will be good at 6V!

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