The civic battery cooling system
Air path on the civic IMA
The civic pack requireds the IMA cover behing the seat to be closed, as the blower evacuates air from the sealed box, and replacement air is drawn in the duct in the rear window well, and is drawn through the pack.
When the IMA box is open, which is required when doing a test charge, the air is drawn into the IMA box everywhere , so no air is drawn through the pack. The test fan draws air up through the pack, so the pack is properly cooled.