Dealers can be stupid. Mine did a battery test with the engine running...!
Then I showed them it dies in 2 minutes of light and radio if the engine is off and they could no longer maintain the battery was good. Tested it again, this time engine off, and hey... got me a new battery under warranty.
Which turned out to be hardly any better.
Some batteries have one bad cell which never gets fully charged as the other cells are brimmed and prevent further charging. So the cell gets worse and worse until only the 5 other cells do anything. If you draw power the bad cell reverses and the voltage drops towards 8, and all the systems start producing error codes and fight for their turn to show it on the MID.
New 12 V battery, problem gone.
Your IMA battery is fine, don't ever worry about that. Gen2's IMA batteries are surprisingly resilient. It is the lead acid one that doesn't live up to scratch, but those are cheap.
I'd advise a non-Honda battery.