Fenix BC06R Rechargeable Bike Taillight

The 90 lumens is plenty bright for city streets, and the fact it runs nearly a full day on a charge means I rarely think about plugging it in. It's so small I forget it's on the seatpost until I see the glow behind me.

The battery life is legit—I've put in several evening commutes without needing to charge, and the 90-lumen pulse is bright enough that cars actually slow down early. The compact size slides right into my jersey pocket when I lock up.

I was worried it would be too bulky for my seat post, but it's surprisingly compact and the 24.5-hour runtime on the lower mode means I barely think about charging it. Even in daylight, cars seem to notice me sooner.