The CMOS (complimentary metal oxide semiconductor) battery in your laptop is a small battery similar in size and shape to a watch battery. This battery provides the power needed to run basic features of the computer while it is turned off, such as time and date. Even though this battery is small it should be disposed of in a similar way as any other computer or industrial battery.
Locate a computer battery recycler in your area. There are actually many electronics retail stores, such as Best Buy (www.bestbuy.com), Office Depot (www.officedepot.com) and RadioShack (www.radioshack.com), that may accept and recycle your CMOS battery.
Take the battery to the recycler and speak to an employee to confirm that they recycle the batteries in accordance with the regulations in your particular state.
Leave the battery with the recycler.