You won't be disappointed. They're solid batteries. I bought the two-pack plus charger
and am very happy with them. The Ankers give an impression of better quality than the Hyperion 2600 batteries. I bought a two-pack plus charger of them too.
I always have at least one (if not two) spare batteries with me. I'm a heavy user of juice, and I don't like to run in power saver mode.