Out of curiosity, how much does that equate to in run time? I'm at 25miles each way on the commute, so I'm looking at 1:15-1:30 each way with the morning being full dark. Most days I can get away with not needing them on the way home.

As a for instance, I get 3 days or so tops on the 4xAA Dinotte in the rear, and charge the front battery packs every night.