Is there a long-lasting rechargable flashlight?

I'd like to have a good, reliable light to keep handy for doing the chicken chores after dark, and also for night-time safety checks. All the battery-powered ones get lost, used & run-down by family members, and/or need frequent battery changes. And I'm such a cheapskate I'll keep using a light even when the batteries start to grow weak, but get annoyed by the dim light it throws.

I just bought a B&D rechargable light and thought I'd found the tool I wanted. It's easy to plug in, flashes when its battery is full, and throws out such a bright beam when first turned on that you could signal passing aircraft with it.

But the light only lasts for 20-30 minutes! I think, I haven't timed it with a clock. But it's awfully annoying to have it go from blazing-bright to dim to dark before the chicken chores get done. That's with a fully-charged battery, if it's partly full the light only lasts about 5-10 min.

And I suspect that the duration of the light is growing shorter with each use, it seemed to last only about 15-20 min tonight.

Why can't a rechargable light be made to last longer? Is there such a thing & if so, what's the brand & where did you get it?