US Patent 7629766 Adapter system for battery-powered tools

An adapter system for providing power to a portable power tool when the original equipment rechargeable battery is removed from the tool and carried separately by the user includes a power tool connector having a contact member configured for insertion into the tool handle receptacle to provide electrical connectivity, a battery connector having a battery receptacle configured to receive the contact member of the battery and a power cord coupled to the tool connector and the battery connector; the adapter system can optionally include a supporting holster or carrier for the battery and connector that can be affixed to the user's belt or a strap or harness worn by the user.