Replacement AC Adapters for G3 ibooks

Hello, I have two ibooks, one at 500MHz and another at 600 MHz. Neither of them have working AC Adapters, so I am looking for a replacement. It seems the only models I can find are 65w, but the ibooks originally used 45w AC Adapters. The question I would like to ask is will the 65w draw more power on my ibooks resulting in a bigger electric bill vs. the 45w versions?

What I mean is will using at 65w AC Adapter result in a larger electric bill vs. a 45w AC Adapter?

Thanks. =)

You know I just bought the same kind of iBook and they sell the 45w AC adapters on eBay.