Originally Posted By: tonyc
My Roomba lighthouse takes two C batteries. I haven't tried the D adapters yet.

Aha! I was trying to remember what I had that took C's.

Originally Posted By: hybrid8
I recommend Sanyo (readily available at Costco if you have one in your area)...

Um...not so much. Perhaps they have them in your stores, but unfortunately not in mine. I should have called in advance, but I drove out instead and they do not sell them in the store. The lady at the info desk said that they'd actually been deleted from the system, indicating that they once sold them in the store, but no longer do.

They sell them on their website, though. But there's zero price advantage to getting them from Costco. If anything, they cost a few cents more than Amazon. Amazon sells a AAA 4-pack for something like $9.95, whereas Costco sells a AAA 12-pack for $29.99. I'm frequently disappointed by Costco price comparisons. The only advantage in this case was that I could have gotten them immediately. But at least they're eligible for Prime, so I'll get them in a few days.
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Matt