I think the article makes the assumption that modern NiMHs are all of the Eneloop type. I think that's fair -- it seems like almost all the NiMHs I see for sal

I think the article makes the assumption that modern NiMHs are all of the Eneloop type. I think that's fair -- it seems like almost all the NiMHs I see for sale these days are the same type. The longer Wirecutter test article it references does go into a bit more about the history of the Eneloops and all the batteries it tested are the same type (which it calls "Low Self-Discharge NiMH"). Also, despite the title, I think the article is really "rechargeable" vs. "single-use". It doesn't explicitly say that the 10-year smoke alarm batteries are alkaline. The ones I've seen are actually lithium.