VPCZ2 - Battery 99% Plugged in, not charging?

The battery on my Z2 refuses to charge past 99% for some reason, Vaio Care tells me the battery health is excellent.

Does anyone know how to fix it and should I be concerned? I've had the machine for about a year and a half, the battery can't already be a mess can it? My Z1 still charges to 100% despite being purchased in 2010 winter.

Thanks for reading.

 

What are your charging habits? Do you always fully charge it and let it run down or are you always plugged in? How long does the fully charged battery last? It is possible that your battery is getting old even though vaio care says its in excellent condition. I suggest you use the the advanced settings in battery care function and reduce your charge threshold to 50 or 80% max as per your needs or you can try re-calibrating the battery as well. On my laptop almost 2 years old it takes almost 30 minutes to charge up from 99% to 100%, have you waited to make sure it does charge it to 100%

 

I'm ashamed to admit I'm painfully careless about my charging habits, the battery usually lasts 7 hours when browsing the web on wifi and some 2 hours when doing very intensive gaming such as FFXIV:ARR

Many days I leave the battery fully charged at 100% and constantly plugged in sometimes for weeks when at work, it does get discharged every now and then but not by a lot.
How do I re-calibrate the battery? You mean the battery settings in power options? Those are as finetuned as can possibly be done, I'm nearly autistic with that kind of stuff so I can allow myself to be careless on other occasions.

 

Calibrating the battery involves charging it up to 100%, then letting it run down to 0% while not using the laptop and then charging it up again to 100%. But in your case that might not work since it doesn't charge to 100%. How about you download a program such as AIDA64 Extreme edition which will show you the exact % of battery degradation so you'll know the health of your battery.

Other than that it might be hard to know if something is wrong with your battery. I believe your battery is OK (other have had this issue with Lenovo and even Macs) and is not charging to 100% because you leave it plugged in so much, they do have an overcharge circuit. Try unplugging it and letting it rundown to 0% ie. until it won't power on, then recharge it with lid closed while it is off and see if goes to 100% after a couple of hours to recharge.

Then I suggest you re-calibrate it and enable the battery care function to only charge it to 80% only, to prolong you battery lifespan.

 

I wouldn't worry about it. The battery charging stops when the system estimates that the battery is fully charged. This is done to avoid overcharging which is very bad for the battery. The method for calculating the point when the charging stops is not very precise - it doesn't need to be, and moreover it has to take into account the capacity loss due to wear. So it is very likely that it is a little bit off. 99% is just 1% off the mark. Let it be.

I too recommend the 80% battery care function. When I don't plan on going out, I use the 50% setting.

 

You could try removing and reattaching the battery, I've had a charging problem on my Z2 once, and reattaching helped.

Not the exact same situation, but perhaps relevant:
http://forum.notebookreview.com/son...011-series-owners-thread-227.html#post8120167
(I've seen more posts about reattaching Z2 batteries earlier as well).