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Is my P50 battery wearing down too fast?

2017-02-19, 21:31 PM

I got my P50 in August and have used it for light schoolwork since then. I haven't ever left it charging nor used it while it was charging. The laptop's been in super low performance mode 95% of the time since I've gotten it. However, my battery capacity has gone down a full 7 watt-hours in only 42 cycles. I know someone else with a P50 who got it a month after me, and has used it for gaming. His battery has only gone down about 1 watt-hour in ~25 cycles.

 

As a side note, how are cycles counted? Is a cycle a set amount of recharging, ie: from 0-100% and is unaffected by the amount of partial charges you do, or is it a measure of how many times the laptop has been charged, regardless of the % charged in each session?

 

Thanks for the help!

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Re: Is my P50 battery wearing down too fast?

2017-02-20, 1:28 AM

The number of watt-hours is not precise and may be off by a few.  The count is full charges.  You would be able to run to 50% and charge to %100 twice.  Again, the count is not precise.


Rich


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Re: Is my P50 battery wearing down too fast?

2017-02-20, 1:36 AM

Is there anything I can do to make the watt-hours more precise, like reseat the battery? I was considering running the built in utility which recalibrates the battery level, but it hasn't notified me that I need it yet.

 

I think I've noticed my total battery life decreasing by an hour or so since I've gotten the laptop, which seems to be pretty crazy in only half a year.

 

Should I go ahead and ask support, and maybe have them change my battery or something?

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Re: Is my P50 battery wearing down too fast?

2017-02-20, 2:49 AM

A battery warranty is one year.  Lithium batteries loose capacity over their life.  I doubt that support would replace your battery


Rich


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Re: Is my P50 battery wearing down too fast?

2017-02-20, 3:13 AM

I thought a standard warranty was three years? It says I still have 880 days until my warranty runs out.

So would you say that my battery either:

 

a. Just losing capacity faster than the battery the other person I know has

b. Not made exactly to be 90whrs due to manufacturing tolerances

c. Not having its capacity reported properly by the lenovo software/HWmonitor

 

Once again, thanks for the replies, just trying to figure out what the problem could potentially be!

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Re: Is my P50 battery wearing down too fast?

2017-02-20, 4:01 AM

I only have an answer for the first part.  Machines usually have 1 or 3 years, depending on model and options purchased.  Normally, machines with 3-year warranty have only 1 year on the battery.


Rich


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Re: Is my P50 battery wearing down too fast?

2017-02-20, 4:15 AM
That's good to know, thanks! I'll leave this unsolved for now in case anyone wants to come in with some of their own experiences.
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Re: Is my P50 battery wearing down too fast?

2017-02-20, 5:33 AM

you said originally that you don't use the machine while charging.  That increases charge-discharge cycles and will shorten battery life.  If you use the lenovo settings application and change the battery charge threshold to stop charging at 90%.  You can use it plugged in and it won't overcharge.  It will not continually discharge.


Rich


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Re: Is my P50 battery wearing down too fast?

2017-02-20, 5:42 AM

I have the charging threshold set to 90% already to lengthen the battery life.

Also, why would not using my laptop plugged in affect the charge cycles? The way I understand it, I can either use the laptop on battery and drain it from 95% to 85%, for example, or use the laptop for the same amount of time while plugged in, draining it from 95% to 85%, the lower bound for charging, and then charge have it up to 95% again. Aren't both of these situations identical?

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Re: Is my P50 battery wearing down too fast?

2017-02-20, 6:34 AM

If you drain from 95% to 85% and charge it backup, that's 1/10 of a cycle.  If it is at 95% and plugged in, it doesn't drain and it doesn't charge.  It stays at 95%  Also, it runs faster


Rich


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Re: Is my P50 battery wearing down too fast?

2017-02-20, 19:12 PM

Battery aging also depends on time, and the actual vendor of the cells (or at least it used to before, when the cells can be Sanyo/Panasonic/.../ some other vendor, which all age differently), temperature, and many other factors. Mine went from 96Wh to 77Wh over a year and ~180 cycles, and it's pretty much in line with other Lenovo laptops I've used.

 

However, counting battery cycles, and taking special care, is counter-productive, as it is a wear-and-tear item. Indeed, if a battery is non-replaceable, worse yet if the laptop can't be even disassembled w/o special tools (like MS Surface, for example), degradation of battery performance effectively limits the usefulness of the whole $1000+ device. Luckily, P70/P50 Lenovo Workstations are still with replaceable battery, so all these worries are really over $80 worth piece of hardware.

 

Just use it, and replace when the battery life becomes unacceptable.

 

 

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