After the reset, the IMA battery SOC indicator may show no charge. This is normal, and will correct it self once the car is driven several miles.
A more aggressive (and wasteful)technique is the forced charge.
The Forced charge procedure is to pull the #15 EPS fuse (40A) from the under hood fuse/relay box, then start the engine in neutral and hold the rpm at ~3500 rpm till the battery gauge becomes normal.
So far the simplest techniques is to just drive normally for 5-10 minutes, and the batteries should charge right up.