Just used these lights towing a boat last night. I drove them all night for 9 hours which means the taillights were on and I religiously use my signals when changing lanes. The battery voltage (alkaline RAYOVAC) at start was 1.61v. Today when I took the batteries out of the flashlights they showed 1.49v. I don't know how this affects the overall battery life but I was very pleased. They are too easy to use! Although the magnets seem strong, I glued them to the frame. I used the wired version of these temporary lights and they didn't stay connected. For me, this is a simple protection for my investment. follow-up inspection I tried using them for the second time and they work great without the backlight. When the tractor headlights are on, when driving at night, the taillights stay on until I apply the brake or turn signals, at which point the headlights go to bright mode. Looks like they are disposable. This is disappointing because I really liked the flexibility they gave me to move the pendants around and not have to worry about the lights working.
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