With all the Rokenbok toys you are purchasing this Christmas, disposable batteries can not only be expensive but bad for the environment.
Disposable batteries are by far the most expensive way to use energy. Depending on the type, capacity, and cost of the battery, disposable batteries carry a price tag ranging from $400 to over $20,000 per kilowatt-hour. In contrast, the cost for using rechargeable batteries is less than $1.00 per kilowatt-hour.
A wall charger and 4 AA rechargable batteries can cost less than $20. Be careful with generic rechargable batteries and do your research on picking Rechargable NiMH batteries or NiCd batteries.
Solar Powered Battery Chargers
If you are really feeling environmentally conscious, you can get a solar powered battery charger for under $15. Obviously, it needs to be sunny out and it will take much longer to charge a set of batteries but won't increase your electricity bill.
Proper Disposal of Batteries
Currently, most batteries collected through household battery collection programs are disposed of in hazardous waste landfills. The use of rechargeable nickel-cadmium batteries can reduce the number of batteries entering the waste stream, but may increase the amount of heavy metals entering the waste stream unless they are effectively recycled. Make sure you properly dispose of batteries and contact your local waste management service to get specifics on battery disposal procedure.