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Applying 'extreme heat' to lithium-ion batteries reportedly restores their capacity, and I think it's the sustainable tech breakthrough of 2025 (www.techradar.com)

submitted 3 days ago by [email protected] to c/[email protected]

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[–] [email protected] 32 points 3 days ago (2 children)

In the good ol' days when I ran out of battery and every charger had a different stupid little connector, I often put my phone on the window still or heater to get a little bit of juice to do what I needed to do.

I guess I am a scientist.

[–] [email protected] 21 points 3 days ago

Wow, this brought back memories of me rubbing my hands against my old Nokia battery in middle school to heat it up and get a couple extra %.

[–] [email protected] 6 points 3 days ago (1 children)

We did the opposite, put it in the freezer

[–] [email protected] 3 points 3 days ago (1 children)

IIRC freezing accelerates the chemical degradation of lithium ion (especially if you attempt to charge the battery at the same time) and tends to lower both the voltage and amperage of most battery chemistries, but it seems plausible that this might

temporarily defeat a cell protection circuit, allowing a charging procedure to initialize, or
delay a thermal failsafe cut-off of a damaged cell long enough to boot or charge a device

Regardless, for those tuning in at home, best to keep your batteries out of the freezer, especially lithium types, unless spicy pillows are what you’re after.

[–] [email protected] 3 points 2 days ago (2 children)

Oh, sorry, since we were talking about the good ol' days I thought it was implicit I wasn't talking about lithium batteries

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[–] [email protected] 21 points 3 days ago (1 children)

How does heat mitigate the dendrites? Also doesn't extreme heat damage the batteries? They barely hold up under high temperatures as-is.