Samsung announced last month that they sold over five million Galaxy Note II units worldwide, and it’s very likely that number has grown since then, and will continue to grow for some time now. Sales of the Galaxy Note II were three times higher than its predecessor as far as early sales numbers are concerned.

The Galaxy Note reached 10 million-unit sales in 10 months after launch, but the Galaxy Note II is expected to reach that milestone in half the time given the current momentum that it has. Samsung says that a variety of new applications along with S-Pen functionality mostly contributed to the continued popularity of the device.

The Galaxy Note II features a gigantic 5.5-inch Super AMOLED display with a 1280×720 resolution. On the inside, there’s Samsung’s own Exynos 4412 quad-core chip clocked at 1.6GHz paired with 2GB of RAM and up to 64GB of internal storage. It also comes packing with a huge 3,100mAh battery for all day productivity.

[via MK News]

The battery is available to purchase right now and uses lithium-ion technology. Mugen promises that the 6400 mAh battery delivers 2.06 times more power than the standard 3100 mAh battery. That much power should virtually double the length of time you can use the Galaxy Note 2.

The battery pack is compatible with the Galaxy Note 2 on any carrier and is available in two colors. The larger battery can be had in gray or white colors to match the color of the smartphone. Mugen lists both battery colors as being available to ship on December 21.

The battery sells for $98.95 and can be ordered now. The biggest downside to using a larger capacity battery such as this is additional bulk. The Galaxy Note 2 is already a bulky device, and this fat battery and the included replacement battery door will add to that bulk.