For those who have switched to using 18650 Li-Ion rechargeable batteries but still have devices that take those D cell alkalines, this adapter might be something you'd be interested in. 

This auction is for a 3D printed adapter which allows a single 18650 Lithium Ion battery to take the place of 2 D Cell alkaline batteries.  This auction is for the adapter ONLY.  The 18650 battery, flashlight & D-cell batteries in the pictures are shown for reference only.  If you are interested in purchasing the flashlight shown, please reach out to me thru Ebay messenger.

Disclaimer: 18650 batteries are designed for ~4.2 volts at full charge while 2x D cells put out 3 volts in series.  Some devices can handle the voltage discrepancy (like your typical flashlight) with no harm, but other devices might be more sensitive.  Be sure to consider this before ordering.

Also, when your 18650 battery requires charging, it must be removed from the adapter.

As this is a 3D printed part, there may be some slight blemishes due to the printing process.  This in no way weakens or affects the functionality of the adapter.

The positive contact is the head of a screw which extends into the adapter body and contacts the Positive terminal of the 18650 battery. The negative contact is the actual battery protruding ~0.5" from the back of the adapter.  This protrusion allows easy access to the battery when it needs to be removed from the adapter. There is an option for a Negative Cap which enlarges the surface area of the negative terminal for devices which use a large diameter spring.

Buy with confidence.  This adapter is made in the USA with materials sourced domestically.

I have sold hundreds of these adapters for 18650 batteries on Ebay; however, I have recently had to relist this posting due to policy changes at Ebay.  If you have any doubts on the quality or functionality of these adapters, please feel free to check out my feedback or contact me with any questions before ordering.

Also if you are looking for a similar adapters for other D & C cell configurations, see my other listing.

Thanks

Condition is New. Shipped with USPS First Class Package