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Battery overcharing

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IanB:

--- Quote from: Halcyon on December 24, 2023, 10:29:23 pm ---There is absolutely no issues with leaving a phone plugged in for extended periods. You won't over-charge the battery doing this. The charge controller will simply stop charging when it's complete.

--- End quote ---

I strongly disagree with this.

I had an old phone that I was no longer actively using, but it had an app I wanted to keep running, so I left the phone on a desk plugged into a charger for a few months. Whereas before the battery would hold a charge for a week, it now will hold a charge for a minute or two before switching off.

I had the same situation with a laptop that was kept in the docking station 24 h/day. Its battery is now useless.

So in my case, there were definitely issues with leaving something plugged in all the time.

Halcyon:

--- Quote from: IanB on December 26, 2023, 11:02:50 am ---
--- Quote from: Halcyon on December 24, 2023, 10:29:23 pm ---There is absolutely no issues with leaving a phone plugged in for extended periods. You won't over-charge the battery doing this. The charge controller will simply stop charging when it's complete.

--- End quote ---

I strongly disagree with this.

I had an old phone that I was no longer actively using, but it had an app I wanted to keep running, so I left the phone on a desk plugged into a charger for a few months. Whereas before the battery would hold a charge for a week, it now will hold a charge for a minute or two before switching off.

I had the same situation with a laptop that was kept in the docking station 24 h/day. Its battery is now useless.

So in my case, there were definitely issues with leaving something plugged in all the time.

--- End quote ---

It depends on the device. I've had a Samsung Galaxy S7 plugged in almost 24/7 for years, nil issues. Same with my Google Pixel phones. My old Lenovo ThinkPad, different story. It depends on the device, manufacturer, software and your individual configuration. What's the golden combination? Buggered if I know. I think it's a combination of "You get what you pay for" versus wisdom.

IanB:

--- Quote from: Halcyon on December 26, 2023, 11:10:54 am ---It depends on the device. I've had a Samsung Galaxy S7 plugged in almost 24/7 for years, nil issues. Same with my Google Pixel phones. My old Lenovo ThinkPad, different story. It depends on the device, manufacturer, software and your individual configuration. What's the golden combination? Buggered if I know. I think it's a combination of "You get what you pay for" versus wisdom.

--- End quote ---

If some devices have issues, we cannot say "absolutely no issues". We have to say, "there may be issues in some cases".

Siwastaja:

--- Quote from: IanB on December 26, 2023, 11:02:50 am ---I had an old phone that I was no longer actively using, but it had an app I wanted to keep running, so I left the phone on a desk plugged into a charger for a few months. Whereas before the battery would hold a charge for a week, it now will hold a charge for a minute or two before switching off.

--- End quote ---

So the battery just completely died. It is not a normal situation. You assume that because B happened after A, B must have been caused by A. In other words, you performed a rain dance ritual, and because it's now raining, it worked.

My guess is, the battery had just died on its own due to the age of the phone. It might have been overdischarged while in storage, for example.

Normally, holding the cell voltage near 100% voltage is still something that a battery can take for years. If not, the thing is broken, and holding at 4.2V is not the cause of the failure. Probably not even the trigger or a contributing factor, although that is possible.

You can disagree, but you are wrong, because facts do not care about agreement.

IanB:

--- Quote from: Siwastaja on December 26, 2023, 11:25:12 am ---You can disagree, but you are wrong, because facts do not care about agreement.

--- End quote ---

You have the theory about lithium ion cell chemistry, I have a fact about a dead battery.

I know that I am going to be cautious about leaving things plugged in continuously, since lithium cell chemistry tells me that leaving a cell at a 100% state of charge for a long time will tend to shorten the lifetime of the cell compared to leaving it in the 50% range.

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