Electronics > Projects, Designs, and Technical Stuff

New Alkaline Battery Leakage Testing

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EEVblog:

--- Quote from: magic on March 27, 2020, 08:23:10 am ---My personal experience: discharge them in a camera until the ESR rises enough that the camera shuts down, then leave them alone for months/years.

--- End quote ---

I have an old AA camera ;D

eugenenine:
Go to the store and buy one of the 30 packs of RayOVac, I have found brand new leaking cells in those packs before.

bill_c:
Maybe its a mechanical problem.  Get a plastic pipe that the cells will fit in that is say .5m or longer and place it over a hard surface (like concrete floor, not wood workbench). Drop a dummy cell in the tube, then the test cell, then another dummy cell, all + side up.  This is kinda simulates dropping a flashlight or remote.  If all goes wrong, it may weaken the seal just enough to leak when discharged in one of the above tests. The potassium hydroxide reacts with carbon dioxide in the air to form potassium carbonate (the white powder) so an enclosure that limits air movement but not sealed (similar to a remote or camera, but not a food storage container).  I think a rapid pressure increase would compress the seal and make it less likely to leak, so I favor a slow discharge from start to end.

schmitt trigger:
Nowadays, most devices don't really turn off but only go into a very low current standby mode.

However, years ago devices had a mechanical switch which would completely disconnect the batteries, and they would still leak.

My suspicion is that leakage has to do with the quality of the battery's construction as well as the other variables.

But as Graybeard mentioned, only half joking, to place batteries in an irreplaceable piece of equipment is the only sure way to cause a battery to leak.

graybeard:

--- Quote from: eugenenine on March 27, 2020, 11:58:02 am ---Go to the store and buy one of the 30 packs of RayOVac, I have found brand new leaking cells in those packs before.

--- End quote ---

I had been happily using Rayovac for many years.  However the last two batches I bought had many that turned into leakers.  Rayovac is now made by the same corporation that makes Enigizer.

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