An almost depleted IMA battery...

Today while we were returning from my daughter's birthday celebration dinner, we encountered some stop and go traffic. We were riding on our 2006 Civic Hybrid and as usual we expect the fuel economy to suffer a little in a bumper-to-bumper routine.
However, it was a little warm today and we even though we had the automatic climate control ON, the battery state of charge was almost depleted in less than 20 minutes in this crawling traffic. So what happened?
Just before the traffic slowdown the battery state of charge was sitting at 6 bars. Less than 15 minutes later the state of charge indicated 3 bars. 20 minutes later the SoC was sitting at 1 bar. From that point on, no electric-only propulsion or EV assist was available and the system kicked into a 4 regen bar routine which lasted for a good 10 minutes after we left the traffic congestion.

Now, this is the second time since last summer that I've encountered this battery state of depletion. The weather was a little warm (30C) and the resulting mileage was still not too bad (5.2L/100km). Normally we get 3.8-4.2 L/100km in this type of typical city driving itinerary.

Anyhow, let the summer come - This is still better than the -40C winters we are accustomed to !!!