In the need of a quick 9V battery connector for one of my project, I realize a DIY way.
9V batteries can be (but sure will NOT) connected to each other.
(safety : you expose yourself in burns doing it)
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Step 1: Soldering
I rip off (gently without any sharp tool) an old empty 9V to get the plate with the metal connectors.
The plastic plate was a little bit to wide, so I cut it to make it fit.
Solder two wires, each to the appropriate connector.
The battery used some paper to insulation the metal parts.
I keep some for the same reason.
Step 2: Housing
I have some big heat-shrinkable tube left, and I decided to use it.
I cut two holes, as tight for the connectors as possible, because they will expend
in the shrink process.