Homedepot offers DEWALT 20-Volt MAX Lithium-Ion 6.0 Ah Battery Pack and Charger Kit for $199 with free shipping.

Product Description:
This battery pack will let your DEWALT 20-Volt Tools keep working longer between charges. The 6.0 Amp hour capacity provides extended run time. To be used with your 20-Volt MAX tools and accessories. Includes (1) charger.