This is an adapter plug that fits onto a Black & Decker 14.4V cordless drill battery pack.
I wanted to use a cordless drill battery pack for a project without disassembling the battery pack (so I could still charge it using the default charging adapter). I was having trouble getting wires to stay attached to the battery pack's prongs so I created a female adapter plug that can easily be inserted onto the prongs.
Print out adapter.
Slide wires through holes in adapter
Remove 10 - 15 mm of insulation off one end of wires
Pull wires back enough so that exposed wire is contained within channel
Hot glue wires where they exit adapter
Attach other end of wires to your project
Slide adapter onto batter pack prongs