this post was submitted on 24 Apr 2025
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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 2 days ago by floofloof@lemmy.ca to c/technology@lemmy.world
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[–] x00z@lemmy.world 32 points 2 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.

[–] rogermiraki@lemm.ee 21 points 2 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 %.

[–] Damage@feddit.it 6 points 2 days ago (1 children)

We did the opposite, put it in the freezer

[–] Septimaeus@infosec.pub 3 points 2 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

  1. temporarily defeat a cell protection circuit, allowing a charging procedure to initialize, or
  2. 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.

[–] Damage@feddit.it 3 points 2 days ago (1 children)

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

[–] Septimaeus@infosec.pub 1 points 2 days ago (1 children)

Ah! Yeah it’s been a while but I seem to recall seeing alkaline batteries in a some freezers or refrigerators sometimes when I was a kid, along with other curiosities like rolls of film. No one ever explained why.

[–] Damage@feddit.it 1 points 2 days ago

rolls of film

Oh right, those were stored in the fridge... weird to think about it.