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I've owned 2X '06 and 15 battery packs.
Classic HCH2 hybrid battery failure. Battery deteriorates to the point that the car is continuously recalibrating and force-charging, robbing the car of power and dropping the MPGs.
HV battery can fail to the point that the 12V won't charge anymore (no alternator; DC-DC converter from the HV system).
Per red, replace the 12V and start there. Also, check the main (-) cable and the ground straps from the engine and cvt to the engine mounts.
Once the 12V is replaced, and the ground are good, I recommend the following:
1) start and idle the car until the IMA system stops charging at idle (or 5 minutes).
2) disconnect 12V battery for 60 seconds.
3) reconnect 12V and repeat #1 for a total of at least 3 times - you want the last time to very quickly show full charged within a minute or two.
Grid charging may also be an option.
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