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Don't keep fully charged Li-Ion in long term storage, they tend to bulge
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RoGeorge:
Thank you all for clarification.  Lesson learned.  Maybe a little late, but we don't know what we don't know.

Next question would be if anybody experimented with puncturing the skin of the battery with a small hole (without touching the internals) in order to deflate it, then covering the small hole with some adhesive tape to seal it against air.

I've seen videos of people doing that (outside, toxic gases and so on), and read online about how they continue to use the batteries for years after deflating them.  Others are saying aged Li-Ion batteries are a fire hazard and to never use them once they bulge, and usually the former will link to a few "classic" videos with intentionally ignited batteries.

I've never seen or heard of igniting Li-Ion in the circle of known people, yet everybody I know uses phones, tablets, laptops, cameras and so on.  :-//

I would like to keep using the bulged batteries for small current circuits, weather station, hallway LED lights with moving sensors, things like that where the low self discharge rate of Li-Ion will make them last much longer than the NiMH cells.

Anybody tried to deflate the Li-Ion then keep using them?
tom66:
With the cost of a new Li-Polymer battery (1000mAh is what, about 5 euros?) I would not bother.  There is good chance the cell will fail and damage something worth way more than that.
Siwastaja:

--- Quote from: Infraviolet on January 12, 2023, 08:02:59 pm ---I always thought the trouble was if you put them in to storage nearly empty, that way they self-drain slowly and have less time before they go below the minimum voltage threshold.
--- End quote ---

Only if the cells are faulty / total crap. Normally, self discharge is nearly zero already at 50%SoC and just gets lower. Case in point, when I measured self-discharge in dozens of cells, I deliberately discharged cells to tad below 0% SoC but they did not lose any more charge during 1.5 year test period.


--- Quote ---I had though the ideal was 75% charged, but anything in the 50% to 100% range was usually ok.

--- End quote ---

75% is not ideal. Between 30-50% could be considered ideal IMO. Although 75% is not that bad, some cell types may have increased calendar fading compared to 50%.
james_s:

--- Quote from: RoGeorge on January 13, 2023, 10:03:54 am ---Next question would be if anybody experimented with puncturing the skin of the battery with a small hole (without touching the internals) in order to deflate it, then covering the small hole with some adhesive tape to seal it against air.

--- End quote ---

Yes people have tried this. There is not really any point, when the battery has puffed up it has been damaged, poking a hole in it certainly isn't going to improve safety. These batteries are known for catching fire if abused, do you really want to risk burning your house down?
SiliconWizard:

--- Quote from: james_s on January 13, 2023, 06:43:36 am ---
--- Quote from: SiliconWizard on January 13, 2023, 02:47:02 am ---Yep. And even 80% is too high when you keep your batteries charged for extended periods of time (say you use a laptop on AC most of the time, and only occasionally use it on battery.) That's an almost sure way of having your battery die within 2 to max 3 years. If you're lucky.

--- End quote ---

I bought my Lenovo X250 new in 2015. I enabled that battery preservation mode that stops charging at 80% right from the start and have only turned it off and fully charged on rare occasions. It spends most of its time plugged in and both batteries still show close to 90% of design capacity. Good quality laptops with good quality (Sony in this case) batteries can last a long time.

--- End quote ---

Haven't had that luck with Lenovo laptops myself.
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