Whoah, I just learned of the existence of multiple AA to D adapters. Eneloops makes a 1 cell AA to D adapter, which seems to me to be a bit underpowered for an appliance that requires D batteries.

You electronics wizards out there, let me know if I'm on the wrong track:

AA and D batteries are all 1.5 V. A D battery produces 4.5 Ah. An AA battery produces 2-3 Ah. I assume the adapter wires the AA batteries in parallel. So that means an adapter with 2 AA batteries can produce 4-6 Ah, and an adapter with 3 AA batteries can produce 6-9 Ah. So why would they sell 3 cell AA to D adapters?