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Phone battery maintenance

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John B:
What are the best habits for charging your phone in this day and age? My last phone went through 3 batteries: the first one ended up swelling due to it being left on the charger a lot at 100%, the second was genuine battery but didn't last more than 12-18 months, by the 3rd battery I learned my lesson. I used a non genuine battery which had obviously less capacity, but I took it off the charger once it reached full charge. It has lasted til present day without swelling up.

Unlike the old phone, my new one, a Pixel 8, has a glued in battery in a sealed case like most new phones. So I would like to maximise its lifespan. So far I have only needed to slow charge the device up to 80%, which is plenty of capacity to get me through more than 24 hours. These seem like pretty basic conventional tips to maintain a battery.

However I read an article which proposes doing what I used to do:

ie leaving the device fully charged and connected to power. In fact it proposes my current habits are detrimental to the battery.

While many of the points seem like they should be correct, ie a modern BMS should be able to manage charging and maintaining of a battery to maximise lifespan, my prior experience tells me otherwise. Also, I would tend to believe manufacturers prioritise battery capacity and charging speed at the expense of longevity. They have an incentive to perform well in immediate reviews and spec comparisons, but have little concern whether the battery goes bad after a couple of years and out of warranty.

The article also alludes to something I have wondered, whether the phone is able to operate purely on external power when it's connected, and avoid cycling on the battery to preserve it's life. Again that seems like it would make sense, if it doesn't result in the battery swelling due to a high state of charge.

You can buy devices which limit how quick and to what level your phone charges the battery.

The article doesn't touch the subject of super fast charging. There seems to be a race going on between manufacturers to make a phone charge as quick as possible. Some even claim 10 minutes. Needless to say this has to be bad for the battery. More sensible manufacturers leave some control to the user. Apple for instance, allows to set the charging speed depending on your habits so the battery life is extended as much as possible.


--- Quote from: John B on March 01, 2024, 11:36:31 pm ---What are the best habits for charging your phone in this day and age?

--- End quote ---

If you're using your phone everyday, keeping it plugged in on the charger overnight won't damage it. Devices like phones don't overcharge lithium cells and some of the more mainstream phones like the Google Pixel, Apple iPhone and Samsung Galaxy phones will adjust their charging behaviour based on your habits (e.g.: If it knows you're not going to be using your phone for the next 8 hours, it'll charge slowly to prolong the life of the battery).

Generally speaking, slower charging is better, avoid complete discharges where possible, and avoid excessive temperatures.

A good quality phone/battery should easily last you several years, even with almost daily recharging. Even if you keep the phone plugged in almost 100% of the time, the battery pack shouldn't swell under normal conditions.

Andy Chee:
My iPhone 7 "learns" the power consumption patterns, battery ageing patterns, and charging patterns.  So if my ancient phone has this capability, I'm sure newer phones have it too!

I have had an iPhone 5 for 10 years, went trhough 1 replacement battery which is still running, though the phone now is only used as a weather gadget and alarm clock. I used only genuine apple chargers each night going to bed and unplugged in the morning. The original battery lasted 5 years with this charging schedule. And I set battery discharge alarm to 15% and critical alarm to 10%.
I think the guy has little idea about what he wrote. Look at what happens to laptop batteries when you mostly use external power. Even if you do not use the battery but leave it in the laptop powered externally, it dies in 2 years.


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