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The wife’s laptop is an older Macbook with a dead battery (i.e. it wouldn’t charge, but used to run fine when connected to an outlet). With the wife in hospital the thing wasn’t used for a while now (and not connected to power). Today I noticed that the bottom plate was deformed. When I removed it I saw that the battery was bulging. While I was watching the battery case cracked open (either because the bulging was still in progress or because the pressure from the backplate was removed). I live in a fourth floor apartment without emergency exits, so I am a bit more than usual concerned about fire hazards. Also I'm clueless about electricity, thus I called the local fire brigade for advice. They recommended that I should throw the battery into a bucket of water to cool it down.

So my first question is, is this the proper thing to do? The internet is in two minds about this, one half saying NOOOO! because lithium (which is what I would have thought) and the other half saying there is no metallic lithium in a lithium ion battery, so that’s not a problem.

In the end I did not do it, amongst other things because there is still a computer attached to the battery - despite using the proper screwdriver the screwheads had sheared off when I had tried to remove it. At the moment the whole thing is sitting in a ceramic pot, wrapped in a watertight bag, in the middle of the back yard, which has a concrete floor.

So my real question is, how dangerous is a depleted lithium-ion battery (I have no idea if the danger depends in any way on the electric charge)? In the unlikely event that the thing will not be stolen overnight I want to remove the battery and salvage the rest of the computer. The only way to get it out will be to break off the latches for the screws, which means I have to hack away a few millimeters away from the bulging battery cells. Is that even remotely safe ? Do I need protection (I should have plastic goggles and gloves lying somewhere)? Or do I worry unduly, and this im completely harmless?

There is a rather similar question, but since I specifically need to break the case of an already damaged (and cracked open) battery this does not quite help (also I’m really curious about the „cool batteries in water“ thing found an answer to that). Also I hope somebody can recommend sensible precautions.

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marked as duplicate by duskwuff, Sunnyskyguy EE75, Michel Keijzers, Finbarr, RoyC Mar 29 '18 at 9:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • \$\begingroup\$ Totally unsourced incomplete information in a hurry: I've seen water advised for reducing the severity of actual battery fires (in the context of being on an airplane where you can't toss the thing outside). I don't know whether it's relevant for a merely puffy battery. \$\endgroup\$ – Kevin Reid Dec 21 '17 at 23:21
  • \$\begingroup\$ I have no comment on the safety question, but it would probably be easier to remove the hard drive than the battery at this point. That way you keep any data that had been stored on that laptop... \$\endgroup\$ – bitsmack Dec 21 '17 at 23:44
  • \$\begingroup\$ I have a backup. Since the battery is all that's damaged I would like to save the rest of the computer. \$\endgroup\$ – Eike Pierstorff Dec 21 '17 at 23:46
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    \$\begingroup\$ I'd still remove the hard drive, at least if it's stolen they won't get their hands on any data you may have on it. And I certainly wouldn't get water anywhere near the battery. Use goggles and gloves and make sure someone else is around when you remove it. \$\endgroup\$ – Finbarr Dec 22 '17 at 0:08
  • \$\begingroup\$ What you did is what I would've done - 1) be glad it hasn't already caught fire and 2) keep it away from anything flammable in case it does decide to catch fire soon. Water does sound like a terrible idea, although water is good at absorbing heat so it might not be as bad as it sounds; water would also damage the rest of the computer. \$\endgroup\$ – immibis Dec 22 '17 at 5:05
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If you're not a specialist I strongly recommend you to look for one who is. Don't try to open it and don't put it into the water. Only a person with correct safety equipment and controlled environment should take care of it.

The battery can be easily removed but don't do it by your self.

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Prepare for the worst case - battery fire. So gloves and goggles and somewhere to place the laptop/battery if it does catch fire. So do the work on maybe a slab of concrete or dirt outside your house. Anywhere where a fire could not spread.

If you do want to put out a battery fire, rather than just let it burn out, then use a hose from a couple of metres away. And don't breath the fumes.

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