Next time you have to replace a 9V battery, UpCycle it before you recycle it. I'm always building battery operated devices and never have enough battery holders or connectors around. But I've found a quick and simple way to make 9V Snap connectors from discarded batteries.
1 - Carefully remove the top from the 9V battery making sure not to damage it.
2 - Cut 2 pieces of wire to the length you want - one black and one red. I typically use 20 or 22 gauge wire.
3 - Turn the battery top over so the terminals are facing down.
4 - Solder the red wire to the female terminal (the larger, cup-like one), and the black wire to the male terminal.
5 - If you want to insulate the connections you can use a dab of hot glue, or cover them with tape.
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