Best Buy: Einhell TE-CD Power X-Change 18-Volt Cordless 1/2-Inch, MAX 1800 RPM Tool Only (Battery&Charger Not Included) 4513946
Einhell 4511481 18-Volt 4.0-Ah Lithium-Ion Power X-Change Battery, Amp, Red - - Amazon.com
Einhell Te-cd Power X-change 18-volt Cordless 1/2-inch, Max 1500 Rpm, Impact Hammer Drill/driver, Tool Only (battery And Charger Not Included) : Target
Battery for TE-CD 12 Li-i - Spareparts / Accessories - Einhell Service
Einhell Power X-Change PLUS 18-Volt Lithium-Ion Compact Battery, 2.6-Ah - - Amazon.com