iBook G4 replacement power adapter and battery

  1. Hi all!
    I have an old iBook G4 12" that needs a new power adapter and a new battery.
    I'd like to know if either of you have purchased what's to be found on ebay?
    Is it reliable harware (seems so anyway)?
    Then what reference should I take?
    Apple only sells 65W adapters now so should I go for a 65W adapter? Or stick to the 45W (as it came out of the box)?
    As for the battery, I guess I'll just follow whatever fits the desciption...
    Best regards,