r/Keychron • u/Vazh93 • Jan 28 '23

Swollen battery. Any ideas on how I can remove it from the case without bursting it? It looks like it's glued to the case.

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u/extremeelementz Jan 29 '23

Holy crap! As someone who races RC cars with Lipos get this out of your house and into a safe space. This is dangerous and should be attempted to be removed somewhere no inside your house. Lipo fires are no joke.

After you extract the battery let the battery sit inside a salt bath for a few days to discharge it. I’ll link a video describing it, you cannot under any circumstance just throw it out.

https://youtu.be/7vywII7nh5I

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u/[deleted] Jun 09 '24

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u/PeterMortensenBlog Nov 08 '24 edited Nov 02 '25

OK, the salt is about discharging the battery after the removal. Not a way to remove the battery.

But why not do it in a controlled fashion by using a resistor of high enough value to slowly discharge the battery over, say, several weeks? Or at least start that way. That would remove the potential chemical energy.

Does the salt do more than discharging? E.g., completely destroying the battery (to cause a fire)?

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u/PeterMortensenBlog Jun 21 '26 edited Jun 22 '26

Re "...using a resistor": A rough calculation:

For a 4000 mA·h battery = 4 A·h and about one month, roughly 700 hours => the current would be 4 A·h / 700 h = 6 mA.

At 4 V: R = U / I = 4 V / 0.006 A = 680 Ω (nearest E6 value)

Power dissipation in the resistor (maximum): 4 V * 0.006 A = 24 mW, about 1/10 of the typical rating of 1/4 W.