Review on Bike Tail Light USB Rechargeable - Super Bright LED Rear Bicycle Light Clip On for Enhanced Cycling Safety - 6 Lighting Modes by Tony York

UPDATE: Based on my initial review below, Keywell contacted me and provided me with a new flashlight free of charge and refunded my money. The new light lasts 7 hours in slow flash mode, so it's a little better. However, I also found that they increased the brightness with a slow flash, which explains why it doesn't come close to the 12 hour lifespan. Because of their excellent customer service and explanations, I have upgraded the rating to 5 stars. Used this flashlight in slow flash mode for two weeks. It's rated for 12 hours in this mode, but after multiple uses I can only get up to 6 hours. I even drained the battery completely several times before charging, but it doesn't help. I drive 3 to 6 hours each ride, so I have to charge after each ride.