That's right. I tried it last night. It doesn't fit PERFECTLY but it does work (Only the BlackJack 1 battery though. I had the Blackjack 2 and the battery is just a cm too wide). The Android system doesn't let you charge the phone with the battery though because it recognizes that it isn't the stock Moment battery. I found a small piece of plastic that's flexible to put in the gap where the BlackJack battery doesn't fit entirely in the Moment but I used it all day yesterday, no problems. Does anyone know what kind of issues this could cause? I'll post the battery serial & part number later today + the tech specs of the batteries (blackjack & moment).