I've bought one of these before and have to say they're great. The triggers are analog, but PS2 only recognizes them as digital (as games were made originally to identify them as).
Furthermore, they have rechargable battery so you just have to connect the USB cable and it'll charge - No batteries needed!
Alternatively, you can try to buy a Mad Catz PS2 Wireless controller which are superb too, but generally they take three AAA batteries while the less common ones only take two (my favorite between the two).
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