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Battery overcharing

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PlainName:

--- Quote from: Kim Christensen on December 25, 2023, 05:51:33 pm ---
--- Quote from: PlainName on December 25, 2023, 10:25:37 am ---Should it not have been taking 0W?
--- End quote ---

No. The phone itself will be using power even though the battery is finished charging and not taking any current.

--- End quote ---

Yes, I realise the phone will be taking power, but it is asleep and if that state takes 4Wh then the battery would last less than a day with the phone doing nothing.

Kim Christensen:

--- Quote from: PlainName on December 25, 2023, 09:59:10 pm ---Yes, I realise the phone will be taking power, but it is asleep and if that state takes 4Wh then the battery would last less than a day with the phone doing nothing.
--- End quote ---

It may not go fully to sleep while it is plugged in.

nctnico:

--- 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 ---
But still, it is better for battery life if the battery is not charged to 100% but to a significantly lower level. Also, many phone chargers, charge at the maximum current. Some phones even claim to fast charge to 100% in 10 minutes or so. This is something you don't need when your phone is charging overnight.

Halcyon:

--- Quote from: nctnico on December 26, 2023, 04:12:04 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 ---
But still, it is better for battery life if the battery is not charged to 100% but to a significantly lower level. Also, many phone chargers, charge at the maximum current. Some phones even claim to fast charge to 100% in 10 minutes or so. This is something you don't need when your phone is charging overnight.

--- End quote ---

Yes, absolutely. But I bet you 99% of people out there don't bother with things like SoC (or even know what it means in any kind of meaningful way). Hardware and software manufacturer's know this.

Phones have been designed to be charged to 100% for decades and left plugged in common scenarios (in a car, while sleeping, on the kitchen bench, in an office until it's ready to be used etc...). Modern phones and laptops also tend to adjust their charging based on your habits. For example, I mostly keep my phone docked when I'm working from home, so my Google phone knows to just charge it using low current. Likewise, my Macbook will only charge to 80% as I mostly use it docked as well.

I'm the kind of person who generally keeps their phone for 3-4 years before replacement, and I've never had a battery prematurely fail or suffer significant degradation.

What we're discussing here has already been thought of and solved (at least by the reputable manufacturers). Your mileage may vary if you're buying Huawei, Nokia, OPPO, Xiaomi, ZTE, or those in the budget categories.

Siwastaja:

--- Quote from: PlainName on December 25, 2023, 10:25:37 am ---I just charged my phone until it said full, and then left it. It was constantly sinking 4W. Should it not have been taking 0W?

--- End quote ---

It should not take 0W, but whatever the phone itself is using. 4W sounds very high unless you are playing games with it, though; for a typical let's say 16Wh battery capacity you would fully drain the battery in 4 hours! 4W should feel like significant amount of heat. I see two possibilities:

1) You simply measured wrong. How did you measure?
2) The battery was not fully charged yet and that power was flowing into the battery.

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