The Everready >primary< AA and AAA and 9V lithiums do not have a drop down regulator.
Just disassembled a dead AA and 9V.
They are pricey but probably worth it for several reasons...
For test gear I seldom use, the 10 year life expectancy means the test gear will probably work when I need it, and, if the lithium goes flat, it won't leak.
For devices like our blood pressure machine, used everyday, a set of lithiums last about 3 times as long as alkylines with no risk of leakage.
For the flashlights in the cars, given the 10 year life expectancy, I can count on having them work when I? need them.
My primary reason for adopting them was lack of leaking and no corrosion, and I pay through the nose for the cells / batteries.
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