I have a number of small Christmas decorations that are normally powered by 3 “AA” batteries. I also have a bunch of 5v USB power supplies just sitting around (various mA). So what I would like to do is power the decorations with a USB power supply. My research said that a AA battery was 1.2-1.5V @ 2000-3000mA. But given the most powerful 5v USB supply I have is only 1200mA, I’m kind of thinking this won’t work (assuming I drop the 5v to 4.5v) ? Might go on, but would be very sloooooow ?
If I’m right and it won’t work, does anyone have any other suggestions ? I have a bunch of these decorations and my rechargeable batteries wind up dead after about 3 days of use.