Garmins only work when you bother to turn them on

Today's run (street): 2.5 miles

With only a couple of days left on my taper, I went out this morning with the goal of bettering yesterday's performance. I was pleased with how I ran on Tuesday so I maintained a slightly longer stride this morning. I listened to my internal metronome at 2/2 time, in hopes of keeping my SPM in the mid to high 80's.
When I was approaching what I'd guess was the 3/4 mark of my first mile, I heard my Garmin chirp. I saw that the watch was going into power reserve mode. Apparently, I never hit the start button when I began to run. I was annoyed, but I decided to run without tracking my time rather than start tracking it at that point. Still, I had a pretty good idea of how long I'd run because I began my run right at 4:00 AM.
Despite having no measurement tool, I pushed my pace using my effort level as a guide to my performance. Given my distance that I measured using Gmaps, I ran approximately the same as yesterday, which is to say, well. Tomorrow will be my final run before my workout and I plan to take that easy. No need to invite injury this late in the game.