"Don't use in sealed environments."
What does that mean? Every battery compartment is a sealed environment. Every drawer. Every house. Every pocket.
Those are my words, not a quote.
Drawers, pockets, etc. are not "sealed;" a Maglite IS more or less sealed.
On the other hand, though, I just found this on the Maglite website:
"Bottom line, if you are willing to tolerate a possibly significant decline in flashlight performance, there is no reason you can’t substitute rechargeable NiMH batteries for (non-rechargeable) alkalines."
Maybe the eneloops (the ones I bought, anyhow) require(d) ventilation, and maybe I overreacted to what I read, but it would cost me too much money to find out the hard way that my interpretation was correct.