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Terminal contacts grease substitutes for batteries?
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David Hess:

--- Quote from: Boris_yo on November 07, 2022, 05:37:48 pm ---
--- 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.
--- End quote ---

They are still NiMH cells, which themselves are constructed the same way NiCd cells are.  I have had a few normal NiMH cells leak exactly like NiCd cells do.  None of my low self discharge NiMH cells are old enough yet for that, but mistreat them and they will leak.

The difference in construction of a low self discharge NiMH cell is the same as low self discharge NiCd cells, if you remember those.  The big difference is that a thicker (polypropylene?) separator is used which is why they have less capacity.

It is not something I would ever worry about.  A leaking alkaline cell makes a much larger mess.
tooki:

--- Quote from: Boris_yo on November 07, 2022, 05:37:48 pm ---
--- 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?

--- End quote ---
What do unused LSD batteries have to do with anything? I said I replaced the backup batteries inside some timers. They were in service for many years, apparently.

They’re little 80mAh 2-pin NiMH button cells with through-hole pins. The original and replacement are both Troily (a Chinese brand). Couldn’t use a name brand replacement because none of the name brands make the 2-pin pinout.

Regardless, my point was simple: anyone claiming “NiMH will not leak” is wrong. Do they leak as often as alkaline? Heck no! But they certainly are not categorically immune to it.
Boris_yo:

--- Quote from: tooki ---
What do unused LSD batteries have to do with anything? I said I replaced the backup batteries inside some timers. They were in service for many years, apparently.

They’re little 80mAh 2-pin NiMH button cells with through-hole pins. The original and replacement are both Troily (a Chinese brand). Couldn’t use a name brand replacement because none of the name brands make the 2-pin pinout.

--- End quote ---

I thought LSD makes these less prone to leaks and wondered whether I should them in remote control or lithiums.

How are these 80mAh 2-pin button cells with through-hole pins recharged?
thm_w:

--- Quote from: Boris_yo on November 08, 2022, 01:27:43 pm ---I thought LSD makes these less prone to leaks and wondered whether I should them in remote control or lithiums.

How are these 80mAh 2-pin button cells with through-hole pins recharged?

--- End quote ---

Trickle charge with a resistor.
Cheap solar lights will have a diode straight from the solar cell to the battery.

https://www.varta-ag.com/fileadmin/varta_microbattery/downloads/service/battery-documentation/nickel-metal-hydride/Sales-Literature-201810_HANDBOOK_Rechargeable_Button_Cells_NiMH_en.pdf
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