I thought the 'freezer trick' for a dead laptop battery was total nonsense

A client brought in an old MacBook Pro with a battery that wouldn't hold a charge at all, and as a joke I told him about the old trick of putting it in a sealed bag in the freezer overnight. He actually did it, and the next day the battery reported 12% capacity and booted the machine long enough to pull his files off. It only worked for about 20 minutes before dying for good, but it saved his data. Has anyone else had a weird, last-ditch trick actually pull through in a pinch?

4 comments

4 Comments

kelly.troy2mo ago

Honestly, is it worth the risk of condensation wrecking the logic board just to get 20 minutes of power? I'd just tell people to keep a regular backup. That freezer trick feels like trying to start a car by banging on the hood with a shoe. It might sputter to life once, but you're still stranded.

wesleythompson2mo ago

My old laptop survived that trick three times.

the_sean6d ago

There's actually a weird science thing behind it. I read somewhere that the freezer can temporarily slow down the chemical breakdown inside old lithium-ion batteries, kind of like how cold slows down a battery drain on a phone in winter. The cold might let some residual charge stay long enough to do a quick pull, but it's not actually fixing anything. That 20 minute window must have been just enough juice that was trapped in there. Still, it's a risk with condensation like you said, so probably not worth doing unless you're desperate. Have you ever seen it actually revive a battery for more than one use?

phoenixk642mo ago

Always thought that freezer thing was a total myth. Had a friend try it on an old phone battery that was completely dead, and it actually gave it enough juice to turn on and grab some photos. Didn't last long, but it worked in a pinch. Makes you wonder what's actually going on with the chemistry.

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