AEDIKO 30pcs AAA to AA Converter AAA to AA Battery Adapter AAA to AA Battery Converter Holder AAA to AA Adapter for AAA to AA Battery

These are about 0.5mm narrower than an AA Duracell. I measured about 14.03mm diameter for Duracell, and these were around 13.5 - 13.6mm with an AAA installed. Home this helps. BTW there was no rattle or looseness with my rechargeable Lithiums.I managed to solder copper wires to each end. The large size popped out during this but it fit back in again fine and it connects well.

I was able to get a super deal on AAA batteries, but, had a bunch of flameless candles that required, AA. So, purchased these and they worked perfectly.