Cheap, high-performance rechargable lights
Here's the work light I made from a riding lawn mower battery.
These are two 50 watt bulbs. You can aim the lights to put the light where you need it. It puts out tons of light and burns for hours.
The connector hanging off the side is for connecting to a trickle charger
And here's the flashlight version. The riding lawn mower battery is a little too heavy to be easily carried.
This battery is a 4 lbs motorcycle/atv battery. The whole thing weighs maybe 5 or 6 lbs.