20 volt to 18 volt adapter?

I am trying to find or make an adapter so I can use my 18 volt Black & Decker batteries on my 20 volt B&D tools or:I am trying to find or make an adap

I am trying to find or make an adapter so I can use my 18 volt Black & Decker batteries on my 20 volt B&D tools

or:I am trying to find or make an adapter so I can use my 18 volt Black & Decker batteries on my 20 volt B&D tools

or:Batteries differ wildly, even if they have the same code words. Only use the charger specifically made for your equipment. Chargers cost a lot but it's cheaper than a fire.

or:You should only be using batteries and adapters that are made for the specific unit.

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