Samsung Galaxy Note II is a awesome smartphone and comes with a powerful 3100 mAh battery, which is quite great. However it is always better to have a more powerful battery which can last longer.
ZeroLemon sells world’s most powerful battery with 9300 mAh capacity which is 3 times more powerful than regular Samsung Galaxy Note II battery. Apart from that the battery comes with all security features to protect your phone from damage.
As the battery is quite powerful it takes something around 2-3 hrs to fully charged.
If you need the most powerful battery for your Samsung Galaxy Note II checkout here for more information and reviews.