Ummmmm.....

I do not understand! An adaptor in this application is by its very nature a kluge. Use the right tool for the job. If you need D batteries, purchase D batteries. If you need rechargeable D batteries, then purchase those - along with the appropriate peripherals, of course. Similarly for 9-volt, A, AA, AAA, C & N batteries. Even lantern batteries, comes to it. They are all 'out there'.

I would not undertake to cut down a tree with a scalpel, nor would I wish to do surgery with an ax. That is the level of discussion applicable here.

Of course, you will get all sorts of advice and offered all sorts of solutions with the full understanding that this venue exist to give bad advice and bad solutions to simple problems, then discuss those same bad solutions across dozens of posts.

Peter Wieck
Melrose Park, PA