Hello.  

I'm referring to simple Ni-MH 9v batteries from a reputable source.
NOT the ebay or AliExpress ones.

I get mine from Jaycar: LINK...

Standard charge is 20mA for 15 hours.
I have mine setup for about 10mA 24/7.

This basically keeps them float-charged for when needed, but I expect there is a limit to this, and I expect it is several years, but eventually, the battery MUST start to fail, so is there any way to calculate that?

I am only interested in a rough figure - something I can use as a reference point for when they need to be replaced.

NONE of these batteries are EVER fast-charged, they are only trickled/floated.

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Smoke makes things work. When the smoke gets out, it stops!

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Edited 2025-06-14 18:16 by CaptainBoing