I was working on my car two Winter's ago. I clipped this light onto the bottom of the car to shine light onto the lower engine. Replaced the starter and moved on. This is a "show" car, so the car is not driven much. After I was done with the work, I could not find the light in my pile of tools. Argh! Well, after 2+ years I was working on the car again. I found/discovered my light still hooked under the car. I pressed the power button and was shocked to discover the battery still had a charge!