You don't.. just replace all the 18volt system with this..( I did,,and YES!! GREAT!)
http://www.homedepot.com/p/DEWALT-20-Volt-MAX-Battery-Adapter-Kit-for-18-Volt-Tools-DCA2203C/206526033
SOURCE: How can you reboot an 18 volt De Walt cordless drill battery it is a nicad
No such thing as rebooting a battery.
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