In my experience, apple chargers don't play nice with android...
Here's a better explanation.
It usually defaults to a 500ma charge unless your using a charge only cable.
http://forum.xda-developers.com/showthread.php?t=1984838
Understood but really I charged the battery directly from the DX50 and also through a generic Samsung charger and found using the DX50 a lot faster without any issues whatsoever. So he should have no problems at all.