3500 mAh battery for Droid X works for Droid X2
Just in case anyone wanted to know, the 3500 mAh batteries that work for Droid X also work for Droid X2 (although most websites that sell these batteries never really make that claim for some reason).
I was using this battery on my DX and loved it. Unfortunately I went swimming and forgot I had my phone with me. Luckily, Asurion sent me a DX2 as a replacement but I was worried the extended battery wouldn't work (as it turns out, the water also killed the battery).
I took a chance and bought a 3500 mAh battery off ebay for about $19.95 and it worked perfectly.
I still have issues with getting a correct battery reading (the phone always thinks the battery is dead by the end of the day when in fact I still have ~40% left) but I just ignore it.
I use my phone HEAVILY - My day starts at 3am and go to bed around 9-9:30pm. I'm constantly web surfing, using facebook, email, weather (every app constantly "pushing" data or refreshing every hour), automatic brightness on, about 2-3 hours of streaming music, play Words with Friends, ZDefense and other battery hogging games, and STILL have plenty of battery left to last me all day.
Yes, this battery if physically HUGE but to me it's totally worth it.
SO in case anyone was interested in using one of these monsters, just know the DO work for the DX2
Hope it helps.