Laptop battery is getting worse after 3 months purchase?

I knew that Lenovo batteries were bad but I didn't know that they were THIS bad! I bought my Lenovo Z510 on May 26th, and the battery is already getting worse.
Design Capacity48000
Last Full Charge39690

It used to last 3 hours (I knew this before I bought the laptop and I thought that 3 hours was do-able), but now it only lasts 2 hours, at 76% it already goes down to 1:34 hours! I can't use Energy management either, when I set EM to "Best battery health" and click 'apply', it simply goes back to 'best battery runtime' which I don't want! Any ideas to either restore the battery or prevent it from getting worse? (I already used 'battery gauge reset' several times, so uncharging it and fully charging it again).

I play The Sims 3 on this laptop and I thought that the high performance for the game might've damaged the battery but I highly doubt it! Before I go to bed I unplug my laptop as well, I don't know what I'm doing wrong.

Guest

Hi yes i know the biggest drain on all laptops is the hard drive. If you get a solid state drive a SSD Å§he battery life is increase very dramatically.

DR Mrs Bears face

If you haven't done so, remove the battery when you use AC. Recharge it only when you need to because rechargeable batteries have limited recharge cycle. Also, li-ion loses charge fast so recharge it right b4 you need it whenever possible.

Alan

First, determine what type of battery you have.
It should be on a label, often on the back side.

Ni-CAD, & nickel metal hydride can be fully discharged, then recharged occasionally.
http://batteryuniversity.com/learn/article/Nickel_based_batteries

Lithium ion ("Li") is just the opposite; keep them fully charged at every opportunity to extend the usable life.
These types should be left plugged in, all the time.
The cells in the battery have 'smart' management firmware that prevents over charging.
They DO NOT need to be discharged, nor is the life of the battery dependent on the number of cycles it goes thru.
http://batteryuniversity.com/learn/article/lithium_based_batteries
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From http://www.infoworld.com/d/hardware/squeeze-more-life-out-your-battery-031
"One component that does not consume much power is the hard disk. In fact, the widely accepted view that SSDs (solid-state drives) provide important power savings over mechanical drives is simply wrong. The power savings delivered by SSDs when compared with hard drives is minimal to nonexistent. Per various hardware vendors, an SSD adds only about 10 minutes of useful life to a battery charge. This fact shows just how far hard-disk technology has advanced: Despite relying on many moving parts, its power consumption runs even with a solid-state device. SSDs should be bought either to ruggedize a system or for performance benefits, but not for energy savings."

DunbarPappy