SYD T1 (International) - Average, some power points available, but you may need to sit on the floor to use them. There're also free Internet terminals available for use.

SYD T2 (Domestic) - Average, as per T1 but without the Internet terminals.

SYD T3 (Domestic) - Very good, there're workbenches you can use, which also have Internet terminals (fees apply). However, there're cables freely available for the most common phone brands for you to quickly charge for a few minutes.

MEL (Domestic) - Average, power points freely available, but you'll need to sit on the floor or use a really long cable.