William Thanks for the info/ link. After charging yesterday I can tell you the Pk Ave surely jumped to life today without even struggling. Somehow I think with AC on and lower idle rpm'* as mentioned, less amperage is going in and 15 min trips may not be the best at all when the fan is set on high etc. At stop lights at idle I can hear the fan speed slow down & voltage drops until you get going again, voltage goes back up and fan speed increases.
I dont know but isn't this a sign of a weak battery or more so and lack of amperage in at idle? I suppose this is may be normal....
In reality, I suppose as long as the car starts I am in good shape.
I have always manually charged my batteries knowing that this ads to the life of the battery and a higher state of charge level to the battery.
I have also felt that unless you do lots of highway driving, your battery will will benefit with an overnight trickle charge monthly.
It should be noted that I am running well above an Optima with an Odyssey battery,
I have 34/78 PC-1500 that should be able to start a jet liner.
Either I got a drain somewhere or the this battery aint what it use to be...will post more once tested.

i think he ctech charges on each mode are time based before it checks the battery. i think the de-sulfation mode is the only one that checks first

Ahh forgot it was an Odyssey, it should last just as long, should be no problem getting 7-8 years from it if maintained properly, I have never considered the cars system enough to properly do so, not based on driving like you mentioned.
By topping it up you are maintaining it as you should.

Harbor Freight Tools has a really nice Digital battery tester
I bought one and it is remarkable the tests it has also tells you how many CCA'* your battery has left in it. copy and paste the link in your browser. I got mine on sale , if you do not need one right away, wait for a sale or a 20% off coupom, no need for those carbon pile battery testers