Charging Laptop Battery to 80% Max When Plugged In All The Time?

Why 80%? my app has a 50% charge to preserve battery setting. They say its even better.

mike54545457444 said:

Why 80%? my app has a 50% charge to preserve battery setting. They say its even better.

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Mine's on 60% but it still trickle feeds. Whether I'll get a few more months out of it with this setting is anybody's guess.
Laptop connected to power about 17 hrs a day.

My HP laptop has a BIOS setting to limit charging to 80%. Your Asus laptop might have a similar setting.

You have to judge what is best. A couple of years at 100% capacity and duration, or a few more months at 80% or less? I would choose the former. Batteries can be replaced when old. Many would buy a more expensive model with greater battery capacity, why limit that?

mike54545457444 said:

Why 80%? my app has a 50% charge to preserve battery setting. They say its even better.

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Who are they - probably some idiot on youtube.

This is pure "bollards".

cereberus is correct.
There is no publicly-available data to substantiate any claim about limiting laptop lithium batteries to any particular level of charge.

Denis

My fairly new machine is a Dell XPS 9520 which I use as a desktop replacement. I also have (can’t remember whether it was included or I downloaded) a software bundle called ‘My Dell’ which has a ‘power’ section where one can set the battery to start charging and stop charging as desired.

I set it to start charging at 50% and stop at 80%. Practically my laptop is always plugged in and remains with the same charging value for months if it is not unplugged. I usually keep it at 57-60% which is considered to be a reasonable charge to optimize battery life. I am convinced that charging patterns can extend battery life.

I also have a ten years old Samsung laptop which was advertised to be operational for 13 hours (that was back in 2013!). My testing experience was about 10 hours, but as you know there are too many parameters at play, still 10 hours in 2013 was impressive. Now, when I bought the Samsung, it recommended to use a propriety software which would limit maximum charge at 80% to extend battery life (obviously with a reduction of the operational time as well), and I complied I have always used it not exceeding 80% of maximum charge.

After 10 years the battery is still capable to run the laptop for 3-4 hours, which in my opinion it is amazing, and probably it would run longer with a 100% charge. Many people would probably say I can afford a new computer anyway after so many years, therefore why bother. True, but if we are concerned with the state of the art at any stage, this is not a cosmetic thing.

callisto said:

I am convinced that charging patterns can extend battery life.

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But you were not convinced by data.

Denis

Try3 said:

But you were not convinced by data.

Denis

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On the contrary, empirical data from my 10 years old Samsung was more reliable than any tests performed for this purpose. As I said most people can afford a new computer every 3-4 years, therefore it is not an urging problem. I usually prefer to buy high end machines but not on a 3-4 years cycle if I can help it. I bought an Asus 17" high end laptop in 2007, after only 6 months the operational time on battery power was less than 1 hour!
I drive a 10 years old hybrid car, and the battery is never allowed to exceed the 80% charge level... Engineering is not an opinion.

In my 10+ year old hybrid laptop/tablet PC Fujitsu Stylistic Q702 the battery lasts at least 6 hours, provided I remove power when charged and allowing it to drop bellow 20% before connecting the charger.

callisto said:

On the contrary, empirical data from my 10 years old Samsung was more reliable than any tests performed for this purpose

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You did not compare data from a battery that was subject to full charging with data from a battery that was subject to limited charging.

That's the problem with discussing this subject, the data is not available.

Denis

Something tells me that a limited charged battery has limited capacity compared to the same battery fully charged. Again I prefer a larger capacity for less months than a limited capacity for longer. Common sense.

spapakons said:

I prefer a larger capacity for less months than a limited capacity for longer

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And there is no data that demonstrates that you will get "less months" of larger capacity.

Denis

I've exclusively used laptops since 2000 and I've always left them plugged in 24/7. I've never needed to be on battery power longer than a few hours here and there, so for my use case I pay no attention to battery longevity. I always add an on-site extended warranty to cover accidental damage and before the warranty runs out I'm always ready to buy a new laptop.

My test laptop (see 1st system specs) originally lasted 3+ hours with a fully charged battery. But after a few months always plugged in without removing the charger, the battery now lasts about 20 minutes. Thankfully a new battery is in the order of 30€ in case I need to take it outside of home.

Try3 said:

You did not compare data from a battery that was subject to full charging with data from a battery that was subject to limited charging.

That's the problem with discussing this subject, the data is not available.

Denis

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I totally disagree, the Asus machine couldn't last more than 1 hour on battery power (full charging), even though it was the most expensive model then. I want my laptop to last at least 3 hours, and therefore a healthy battery in the long run is of paramount importance. Now if you can afford a high end computer every 3 years, good for you, you don't need to read this thread.

callisto said:

I totally disagree, the Asus machine couldn't last more than 1 hour on battery power (full charging), even though it was the most expensive model then. I want my laptop to last at least 3 hours, and therefore a healthy battery in the long run is of paramount importance. Now if you can afford a high end computer every 3 years, good for you, you don't need to read this thread.

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So, by your logic, my two years' use of a battery that was always connected to power & charged to 100% and that remains at 100% [ratio of Last full charge to Design capacity] proves that fully charging batteries does not degrade them.
I disagree with that statement even though that has, indeed, been my experience.

callisto said:

Now if you can afford a high end computer every 3 years, good for you, you don't need to read this thread.

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Resorting to argumentative language does nothing to advance mutual understanding of battery management system performance.


Denis

Most entry level laptops have a 2-3 hours battery which thankfully is cheap to replace after a couple of years or more.

i have just checked my 3 year old Dell xps 17 that has been set to the "recommended" battery usage setting and has been used on both mains and battery depending on what i need at the time. After this amount of time it still shows 100% batt availability so I am happy to let the system continue to monitor and control the charging

barman58 said:

i have just checked my 3 year old Dell xps 17 that has been set to the "recommended" battery usage setting and has been used on both mains and battery depending on what i need at the time. After this amount of time it still shows 100% batt availability so I am happy to let the system continue to monitor and control the charging

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Wow, I've never had a laptop showing 100% battery availability after 3 years of usage. Regardless of how it's used.
Edit, unless I'm misunderstanding what you mean by availability.