Hi, I was wondering if anyone could offer me advice / guidance on a project that I want to try, the problem I've got is that my daughter collects things called illumi-mates which are small night lights that come in all different types of characters, they are powered by 3 AG13 button cell batteries and at the moment she has about 20 of them, as you can imagine replacing those batteries approximately every 2 weeks is a pain and expensive, what I need ideally is a mains powered adapter with circuitry to deliver 4.5v to each of the lights but also making it safe to be in a child's bedroom. thank you in advance for any ideas