I bought 2 orbs, off seperate credit cards (one for mom's house, one for dad's), and because i had left the included adapter at moms, i just used the cord and adapter that came with the phone for the orb. I then noticed it charged fine but had a very hard time topping off and getting to 100%. This is when i got my second one, and opened up the orb's adapter to read the power ratings. The orb's adapter is rated for 5v but 1.8 amps, while the one that comes with the PHONE is, too, rated for 5v but a lesser 1.2 amps.

Moral of the story: USE THE ADAPTER INCLUDED WITH THE ORB.