Thanks @ PiModules! I'm sure many people will like it!
I think r4049zt
is right! These 1,2V are not fix, a full charged has more, if a little bit discharged it goes lower ...
That's why I would see this
I've had better sucess with a 1Amp rated DC-DC buck regulator, so that is does not care whether batteries are 6xAA almost flat or 13V car battery. That regulator, set to 5.0V out, can also take input from cheap >6V unregulated rectifier transformer power supplies, though the extra diodes to make a seamless battery or transformer choice would knock 10% off efficiency.
as the correct way!?
And for safety: I'd also prefer NiMH ...