Does anyone know what the mAh rating is for the Battery BacPac? I've been searching for almost an hour and can't find an actual number.

Since all the documentation I've read and the videos I've watched mention that it will double the battery life, I'm going to assume it's 1050mAh like the battery that comes with the 3+. If someone could confirm that, or provide the correct number, I'd greatly appreciate it.

Many thanks in advance.