Amazon.com: AuthFrank BS18DL Battery Adapter converts for Bosch 18V Lithium Battery to for Dewalt 18V/20V Lithium Battery DCB184/DCB181/DCB182/DCB200/DCB201 etc. : Tools & Home Improvement
DEWALT 18v to 20v Adapter - Bare (DCA1820) - - Amazon.com
Powerextra 3.7Ah 18V DC9096 DC9098 Replacement Battery Compatible with Dewalt 18 Volt XPR Battery DC9099 DW9095 DW9096 DW9098 DE9038 Cordless Power Tools - - Amazon.com
DM18M Adapter converts for Dewalt 20V Lithium Battery and for Milwaukee 18V M18 Lithium Battery to for Makita 18V Lithium Battery BL1830 BL1840 BL1850 - - Amazon.com