General > General Technical Chat
Long life batteries
G7PSK:
Just had a lab clear out and found at the bottom of a pile a cycle lamp with two Ever ready C size (R14S) silver seal batteries dated 05 week of 1995 still at 1.47 volts and have not leaked. Batteries say made in Britain. Wonder if this is some sort of record.
Siwastaja:
Open-circuit voltage is only part of the story. For example, smoke detectors actually apply a load to test the voltage sag to make sure they can extract the required energy to make the sound in case of fire. Kind of a DC ESR measurement.
Test it under load of a few ohms.
G7PSK:
The lamp still lights on the batteries and almost as bright as a new set.
staticresident:
Well that sure beats my M1A cells from those dewalt battery packs I salvaged many years ago. I thought I was doing good at 10+ years of age.
Siwastaja:
--- Quote from: G7PSK on February 03, 2022, 01:01:33 pm ---The lamp still lights on the batteries and almost as bright as a new set.
--- End quote ---
OK, then it's quite an achievement!
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