Outdoor solar lighting is very common to see in people's front lawns, backyards and gardens. It's convenient because you don't need to install electrical wiring, and it's eco-friendly since the lights harness the power of the sun. But over time, the lights may seem less brilliant and powerful. To give your solar lights a tune up, do two things: First, wipe down the integrated solar panels on top. Dust, pollen and dirt can block the panels from absorbing the sun's rays, which prevents the integrated batteries from charging. Second, if the lights are more than two years old, replace the internal rechargeable batteries with new ones. Then recycle the old rechargeable batteries in a free Call2Recycle box you can find at stores like Lowe's, Best Buy and The Home Depot.