Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Isn't dendrite formation and the shorts they can cause a much bigger concern when dealing with old batteries that are being charged 24/7? Asking a genuine question here, so please don't shoot me if I'm wrong. π I'd love to hear more about the most common failure modes and causes for li-po/ion batteries.
Those are symptoms of sitting at that operation point permanently, and they are a of course a concern. What I'm after is that people think that energy gets put in to the battery, i.e. it gets charged, as long as a "charger" is connected to the device (hence terms like "overcharged"). But that is not true, because what is commonly referred to as "charger" is no charger. It is just a power supply and has literally zero say in if, how and when the battery gets charged. It only gets charged if the charge controller in the device decides to do that now, and if the protection circuit allows it. And that is designed to only happen if the battery is not full. When it is full, nothing more happens, no currents flow in+out of the battery anymore. There's no damage due to being charged all the time, because no device keeps on pumping energy into the cell if it is full.
There is however damage from sitting (!) at 100% charge with medium to high heat. That happens indipendently from a power supply being connected to the device or not. You can just as well damage your cells by charging them to 100% and storing them in a warm place while topping them of once in a while. This is why you want to have them at lower room temperature and at ~60%, no matter if a device/"charger" is connected or not.
(Of course keeping a battery at 60% all the time defeats the purpose of the battery. So just try to keep it cool, charged to >20% and <80% most of the time, and you're fine)