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x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 0:30 AM

I have an x230 and in the Power Manager I have "Custom charge threshold" enabled, with "start charging when below 15%" and "stop charging at 98%".

 

In doing this I am assuming if I left the laptop plugged in the battery level will oscillate from 15%, to 98%, then drain away back down to 15%, recharge back to 98%...... etc.

 

However, the battery is charging up to 98% and then simply remaining at 98%. I do not want this because it's bad for the battery health. I would like the battery to drain charge, as per what the Power Manager settings state.

 

Anyone know why it's not?

 

I am using Windows 7, 64-bit

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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 1:20 AM

 wrote:

 

In doing this I am assuming if I left the laptop plugged in the battery level will oscillate from 15%, to 98%, then drain away back down to 15%, recharge back to 98%...... etc.

 

However, the battery is charging up to 98% and then simply remaining at 98%. I do not want this because it's bad for the battery health. I would like the battery to drain charge, as per what the Power Manager settings state.


Actually the battery will discharge very slowly below 98% until it eventually reaches 15% and then the recharge begins. The issue is that this discharge is extremely slow, perhaps 1% per week.

 

That said, if you want to maximize battery health, the charged threshold should be well below 98%. Some people recommend cycling between 20% and 80%. This is certainly better than going to 100% (or 98%.)

 

But Lenovo Battery Manager's default thresholds are something like charge at 60% and stop at 65%. If you run the X230 mostly on mains, I'd recommend Lenovo's very conservative thresholds.


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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 1:27 AM

Hi, you said:

"Actually the battery will discharge very slowly below 98% until it eventually reaches 15% and then the recharge begins. The issue is that this discharge is extremely slow, perhaps 1% per week."

 

I think you misunderstood me because I used the word discharge:

 

I have the laptop turned on, it charges up to 98%, i then expect it to stop charging, the battery slowly drain to 15% and then charging recommence...... all the time the laptop is switched on.

 

My point being the laptop charge should decrease from 98% to 15% at the normal usage rate?

 

Regardless of the numbers used, why does charging still persist when the threshold is met?

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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 1:38 AM

 wrote:

 

 

My point being the laptop charge should decrease from 98% to 15% at the normal usage rate?

 

Regardless of the numbers used, why does charging still persist when the threshold is met?


Because repeated cycling reduces the battery's life, especially if the X230 remains plugged into AC mains.

 

Consider that the typical life of a Li-Ion battery is around 500 cycles. Suppose it takes 6 hours to drain the battery from 98% to 15%. That would mean 4 cycles per day. If left on mains 24x7 the battery would go through 500 cycles in about 4 months.

 

 


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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 1:57 AM

But at the moment my laptop reaches 98% and then charges constantly, to stay at 98%. How can this be any better? Unless are you saying it's healthier for my laptop to stay charging at 98% for hours, than to drop to 15% and recharge back up to 98%?

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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 2:03 AM

faa77,

 

Its not charging.  When it shows 98% it should show "plugged in, not charging".  It will draw from AC power instead of the battery.  Over a period of time it will drain about 1% a week.  When it hits 15% it will start charging again.  I think because its not dropping from 98% you think its charging.  Its not.  See below.  My computer is set to charge between 60-80%.  I charged it to 100% the other day when I thought I would be away from AC.  Now even though its plugged in, it wont charge until it hits 60%.  My laptop is running modern standby so I lose about 1-2% a day vs your laptop it migh lose only 1% a week.  

 

 


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T14, T490, TP 25 Retro, X1 Yoga 3rd Gen, W510 850 EVO, A30p
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  • Message 7 of 9

Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 2:03 AM

 wrote:

Unless are you saying it's healthier for my laptop to stay charging at 98% for hours, than to drop to 15% and recharge back up to 98%?


I'm no expert but from what I've read it's better to leave the battery charged constantly than to constantly cycle it between 15% and 98%.

 

But in any case, why 98%? Why not 100%? It seems to me there's effectively no difference.

 

If you want to make a significant difference, i.e. a significant improvement in battery health, then reduce the threshold to 80% or even lower.


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  • Message 8 of 9

Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 2:41 AM

I have changed the setting from custom to "Automatically optimize for battery lifespan". However, it's currently at 91% and still charging (the % is increasing). Does this seem right? The battery is a few months old.

 

I mostly use my laptop with the mains plugged in. I rarely use the laptop without the mains.

 

I would really like to maximize the lifetime of my battery.

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Re: x230 continues charging when reaching "stop charging at" threshold

2019-07-22, 3:00 AM

See below post.  What you see is correct.  I know on my W510 it does the same.  

 

https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/automatically-optimize-for-battery-lifespan-charges-the-batt-to/td-p/1251901

 


 If a post answers your question, please mark it as an”Accepted Solution“!
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 I do not work for, nor do I speak for Lenovo. I will not respond to unsolicited private messages. Questions belong in the forum so it may   help other forum members as well.
T14, T490, TP 25 Retro, X1 Yoga 3rd Gen, W510 850 EVO, A30p
 Retired 385D, A20p, A21p


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