Switch to rechargeable batteries

Rechargeable batteries will save you money versus single use batteries, plus it will mean you're not caught short because you can simply recharge them.

This is especially good with children's toys, bike lights and games that require batteries. 

• Save Money: When used properly, rechargeable batteries can be used hundreds or even thousands of times! They do cost more initially, but can definitely pay for themselves over time. 
• Conserve Resources: Because rechargeables can be used over and over, fewer batteries need to be manufactured (and transported) than with single use varieties. In fact, rechargeable batteries consume up to 23 times less non-renewable natural resources than disposable batteries. 
• Protect the Environment: Most people don’t realize the extent of single use batteries’ environmental impacts. Heavy metals, corrosive materials, and other nasty chemicals combined with (all-too-common) improper disposal spells bad news for the environment. But rechargeables have 28 times less impact on global warming, 30 times less impact on air pollution, 9 times less impact on air acidification, and 12 times less impact on water pollution!  
• Performance: Many of today’s rechargeables actually last longer on a single charge than their disposable counterparts, especially in high-drain devices.

When you do use disposable batteries, recycle them rather than throwing them in the bin. In landfill, they can leak harmful chemicals. New batteries can be made from recycled materials. Batteries use materials that have a significant impact to mine and process, such as zinc, lithium, mercury, silver, but these can be infinitely recycled.