As an electronic technition gone mechanic, I may have some "insight" to what is realy going on with the charging system.
I have noticed the battery evaluates itself just about every time computer codes or a data stream are accessed by a scan tool. i keep seeing mentions of a "hidden charging system" as well.
The batteries in the HCH are not realy batteries in the chemical sense as much as they are a bank of capacitors. the monitoring system is as far as i can tell, a mini management system for the capacitors. I believe it is posible for this system to move the charge around and test capacitance abilities, and during this, you will see the meter do strange things. This hidden charging thing may just be the charge being moved around in the bank of capacitors, and making the meter fluctuate. Maybe the monotor only sees one of the capacitors. If anyone has any comment, i welcome it. I am trying to learn myself. Honda is being very tight liped to aftermarket machanics about this stuff.

sarah