August 28, 2024

C to D Battery Adapter

I recently bought one of those tennis racket bug zapper things but neglected to read what kind of batteries it takes before checking out.  I assumed it took a 9 volt but it turned out to require 2 D batteries.  Digging in the back of the junk drawer I did find (1) D and (2) C batteries that while way past their prime they still worked when tested.  Being your typical maker I decided it was easier to spend a few hours printing an adapter rather than take a 5 minute trip to the store to buy more batteries. 🙂

The design only took a about a half hour to make in Fusion and is pretty basic…. A top, a Bottom, and a Extension Connector Plug.

The 3 separate pieces took probably an hour and a half to print.

The battery gets inserted into the top adapter piece and some aluminum foil is wrapped around the Plug before inserting it into the bottom piece.

When the bottom piece is screwed to the top piece the aluminum foil is crushed to provide contact to the negative side of the battery.

The positive side of the battery is allowed to protrude through the top of the adapter case.

Here is a comparison of the original C battery, one in the Adapter, and a D Battery.

This is the adapter installed in the Bug Zapper.  You do have to be careful not to tear the tinfoil on the lug when inserting the adapter into where ever it is used in.  (I doubt these old batteries will last long but the adapter is still a handy thing to have on hand in case I need it again.)

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