Sad story started 2 years ago, when I had a Black&Decker 16V Lithium Drill/Driver, it looks nice and powerful, came with a 16V lithium battery, chargeable. After you fell love with it, you need a 2nd battery to keep it alive always. But nowhere can I find this 16V battery again, it disappear from earth, and our nice manufacture discontinued this product and replaced with some newer one. I had no idea what's the newer one, and had no interest to spend that money again, and let my 16V beauty and her battery slept forever... It's not environmental friendly too, right?
The only selling batteries I saw is 18V and 20V. I like 20V, but it's longer than 16V, and do not match the drill (What a clever manufacture...).
Tried many thoughts of solutions, with 3D design and several 3D printed model test, finally came out this tiny little cutie, it's an adapter for the 16V drill to 20V battery, put it at bottom of the 16V drill, then slide on 20V battery, it will "Click" exactly fit. So you have a 16V drill with 20V battery, and no need buy again a newer manufacture thing. ( Do not forget first to get rid of a stopper at one side of 20V battery, see the photo.)
Manufacture suggests not use 16V with upper voltage battery, but I used it with 20V, and tested for a long time, mine is not burned or exploded, just for fun, you can use it, but I do not promise any malfunction, and I'm not responsible to any damage, again this just for fun. It is just an adapter, and it's your risk to use it play with your nice drill.
I hope your story have a same happy end as mine...
Material is PLA, 3D printed by Lulzbot Taz6. Size is 1-3/8" x 2" x 1/2".
Please be aware it's just a small adapter. Thank you !