I have 2 strings of 100 white LEDs each that are powered by a battery pack of 3 AA batteries for each string. What I would like to do is use one of my low voltage power supplies that are typically used for landscape lighting and get rid of the batteries. The power supply outputs 12v with a maximum of 200w. Is this feasible to use as a power source and if so what would be needed to run them off the power supply at the correct voltage and amperage? If there are other suggestions for powering the lights, I'm open to them. I just want to get rid of dealing with replacing batteries on the regular. For reference, the lights go in a cabana that we sit in most evenings so we would go through quite a few. Any help would be appreciated.

Update - 6-27-2021 First, thanks to everyone for giving me some great direction. To clarify, the three batteries are run in series and it has a IC board that is the on/off switch. Position 0 is off, position 1 is flashing LED and position 2 is on constant. The flashing is seizure inducing and I would NEVER use this.

Sounds like I could also use a powered USB hub with 5v to power the strings. I have one that has 4 ports so this might be the other option.

Again, thank you for the help!