General > General Technical Chat
Terminal contacts grease substitutes for batteries?
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coppercone2:
I have seen real eneloops leak. They don't leak alot but it does occur at the positive terminal.

BTW I don't know if I would recommend silicone WD40, I do use it, but I had stuff rust with it on. Its just not as good as grease.

Take a piece of clear glass, spray some on, and see what happens over time.. I always meant to.

I use the silicone wd40 for things that are hard to access/annoying and I need it working with lubrication that is more trustworthy and longer lasting then regular wd40 which is kinda dodgy for protection IMO. I don't think it would be my top choice for a 'easy to access job', but you would need to do experiments, I never found the time to try to get to the bottom of lubrication.. it might be acceptable. I bet it would be OK for wafer toggle switches.. but I use deoxit spray for that. Sometimes dealing with the metal folds breaking is more annoying then using excess lubricant.

One thing I do like from wd40 is the long term corrosion inhibotor that smells like mothballs.. well you can mothball something with that. I sprayed it on stuff I just don't have the energy to protect otherwise, and its in surprisingly good condition after being left in un regulated nearly outdoor conditions for long periods of time. I guess its cosmoline spray. But it gets really tacky and eventually dries up like wax or something. But better then having to clean a bunch of flat bars from rust 2 years later after throwing them under a awning. Clean it off with a rag of fresh regular WD40 from the bottle or cheap solvent of choice before use. Kind of expensive but it prevented some rage IMO.

And I don't know what silicone without dielectric properties is. Maybe it means that its more pure. Some electrical greases have like silicone dioxide in them for some reason, I don't know why. I assume its incredibly fine powder. But all silicone is very dielectric. When they give it a dielectric grade, it might be related to high voltage behavior. Perhaps some grades have a lower dielectric constant, (worse at arc prevention). Unless its another reason, I don't think you need to worry about that with batteries unless its in a electric car or something (like a passanger car). Or it might have to do with the consistency, i.e. for the 'grease packing' application I mentioned, you might need a assurance for code reasons that the grease will not flow out of the enclosure and stay in the same place for 20 years to make a ingress seal. Perhaps they add some stuff to it to make it more thick.
Infraviolet:
Wouldn't the best protection here be a sacrificial little circular sheet of metal? A washer but without the central hole. Conductive, and able to be the first victim of a battery leak before the messy stuff can reach the device's built-in terminals?
David Hess:

--- Quote from: wraper on October 29, 2022, 11:00:03 am ---Unlikely to protect from anything. NiMH will not leak. When alkaline leaks, not likely it will save anything.
--- End quote ---

Like NiCd, NiMH will eventually still leak, or leak if overcharged.
Boris_yo:

--- Quote from: tooki on October 29, 2022, 04:04:55 pm ---
--- Quote from: wraper on October 29, 2022, 11:00:03 am ---Unlikely to protect from anything. NiMH will not leak. When alkaline leaks, not likely it will save anything.

--- End quote ---
Whatever gave you that idea? I just replaced the NiMH backup batteries in a bunch of timer outlets. 3 of 4 had leaked.

--- End quote ---

There's eneloop/Sanyo brand of LSD (low self-discharge) NiMH batteries that still retain 75% of charge after 10 years if stored unused. Which brand have you used that leaked?


--- Quote from: David Hess on October 31, 2022, 02:23:27 am ---
--- Quote from: wraper on October 29, 2022, 11:00:03 am ---Unlikely to protect from anything. NiMH will not leak. When alkaline leaks, not likely it will save anything.
--- End quote ---

Like NiCd, NiMH will eventually still leak, or leak if overcharged.

--- End quote ---

Which brands? Not the ones with batteries with LSD capability? Somehow I highly doubt brands like eneloop will leak.
Boris_yo:

--- Quote from: wraper ---AA/AAA NiMH almost never leak. I've seen some reports of small batteries which are soldered onto PCB leaking, but that's about it

--- End quote ---

Are you referring to certain brands with LSD batteries like eneloop?

I am wondering whether I should put lithium AA betteries or LSD batteries into AC remote. I only use it in summer, maybe a few times in winter. The rest of seasons it remains unused. I could store it without batteries but I want a "set it and forget it" solution where I could store it with batteries without worrying about them leaking and rendering remote control unusable.
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