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Eveready zinc-carbon AA cell, which I was AMAZED to find not only hadn't leaked over the last 40 years, but still read 1.5 volts on my DMM! I didn't install it, though, opting for a modern alkaline AA cell instead.
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About 5 years ago, I replaced the original carbon zinc Ray-O-Vac battery that had been in my V-7a VTVM for over 50 years with a new Duracell. Recently the meter was observed to be somewhat erratic... turns out, the Duracell had leaked extensively, causing some damage to the circuit board. The old Ray-O-Vac is *still* leak free, but is down to 1.43 Volts.
jr