Jacob PrattMar 6

Perhaps a silly question, but why don't portable power banks (when wired) use the 3.7V that both the battery and device it's charging already have? Why the need to convert to 5V (or higher), necessarily adding nontrivial losses?

Surely it's not only because that's what the USB standard says?

#electronics #technology

Show threadhackguy
@jhpratt wellll, the newer ones *kinda* do, it's called programmable power supply (PPS) mode, and one of the use cases for it is direct battery charging: The device can request a specific voltage between 3.3 and 21V, which can then be piped directly into the battery without further conversion
Mar 6 at 6:13amWeb