Lenink AC Power Supply Adapter for AAA Battery,Replace 2 AAA Battery,Black

They do have battery to AC adapters (at least they do for US outlets). I use them for my Book Nook kits and other lighted models.

Have you thought about battery replacement kits? This one and others by the same brand I’ve used in the past to great effect. https://a.co/d/0hADbdiX