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Don't keep fully charged Li-Ion in long term storage, they tend to bulge
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SiliconWizard:

--- Quote from: thm_w on January 13, 2023, 02:29:41 am ---Yes its widely known, but outside of "highish-tech" hobby chargers mentioned, I've never seen consumer products that offer to charge your device to 40-60% for storage. I'm sure they exist, its just not very common.
--- End quote ---

I have absolutely never seen that either, outside of, as you said, dedicated chargers. I have one in the lab that can do this and much more.
But in consumer products, never seen it whatsoever.


--- Quote from: thm_w on January 13, 2023, 02:29:41 am ---80-85% is to extend the life during regular use, and is not intended for storage or shipping purposes. And even then I'd say a lot less than 50% of products offer that.

--- End quote ---

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.
james_s:
Yes 80% is not a storage charge. My point is only that time spent charged above about 50% causes accelerated degradation. Storing at 90% is better than storing at 100%, storing at 80% is better than storing at 90%. The ideal state of charge for maximum lifespan is around 40-50%. I've read that a lot of military equipment charges Li-ion cells to around 4V instead of 4.2V as it results in a significantly extended life at the expense of capacity. This is true of almost all Li-ion chemistries. The only one I know of that is known to tolerate fully charged storage is LiFePO4.
james_s:

--- 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.

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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.
tooki:

--- Quote from: RoGeorge on January 12, 2023, 09:19:41 pm ---
--- Quote from: SiliconWizard on January 12, 2023, 08:23:21 pm ---Every LiPo battery that I stored...

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The ones i have are Li-Ion, kept from former 2G or 3G mobile phones that are now out of use.  Never had LiPo, heard they have to be charged while kept in an anti-explosion protective bag, though they are heavily abused in their day to day life, for example in racing remote controlled models, sumo robots and such.

Are you telling about bulging LiPo because this is the type that happened to bulge from the ones you have, or because LiPo are about the same as Li-Ion?

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Your mobile phone batteries are almost certainly LiPo, because it’s the technology that lends itself to the flat, rectangular battery shape, and because it weighs less.

But you’re not wrong that they’re LiIon, because LiPo is a type of LiIon battery.
tom66:
DJI drone batteries will "self-discharge" automatically after about 3-4 days in storage, to around 70% capacity.  This is the battery electronics doing this, using the balance resistors on the battery pack.
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