2h of battery just disappeared...

About 3 months ago (or so), my laptop used to be able to run on battery for at min 3h. About a month ago, I noticed, about 1,5 hours of battery life has just disappeared magically... Now, my laptop only manages to run on battery for about 1 hour or so with battery saving setting turned on. What happened to my battery? How could it have worn of so fast. My laptop is 1.5 years old. Sometimes i forget to take out the battery when it is fully charged, how ever, battery never gets hot, so, as I know, it should not wear of that fast, especially in ~1 month period...

It sounds like the battery is starting to fail. Sometimes, a cell or a few cells go bad, and that drastically reduces the capacity of the battery.

noskas16 said:

About 3 months ago (or so), my laptop used to be able to run on battery for at min 3h. About a month ago, I noticed, about 1,5 hours of battery life has just disappeared magically... Now, my laptop only manages to run on battery for about 1 hour or so with battery saving setting turned on. What happened to my battery? How could it have worn of so fast. My laptop is 1.5 years old. Sometimes i forget to take out the battery when it is fully charged, how ever, battery never gets hot, so, as I know, it should not wear of that fast, especially in ~1 month period...

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What Causes Lithium-Ion Batteries to Age......

Actually there maybe several but i knew few of them.

1) High voltage and Overcharge
Laptops typically have a charge threshold, which prevents overcharging and high voltage. However, constantly keeping the battery at a full charge also is a stress factor that contributes to aging.
2) Heat
Room temperature (21°C / 70°F) or higher temperatures promote chemical reactions, ultimately causing Li-Ion batteries to lose capacity.
3) Low Temperatures
Temperatures below 0°C (32°F) can damage materials inside the battery.
4) Prolonged Storage
Li-Ion batteries self-discharge at a rate of approximately 8% per month at 21°C (70°F). This increases with higher temperatures. When stored over long periods of time, the battery can reach a state of deep discharge (charge below 20%).
5) Physical Shocks
Batteries can break.

You should have a look on this article explaining about do and don't of batteries.

Tips to Extend Your Laptop Battery Life

Hope this helps you.

Try doing a full discharge and then a full recharge.

Full discharge means leaving the thing on until it dies, not just turning it off when the battery says "battery low". I'm betting it will run quite a while after it said "battery low".
Full recharge is leaving the computer off with the AC plugged in, recharging the battery.

This resets the battery controller's opinion on the battery's real capacity. (Yes, what says you "battery low" is the opinion of the battery controller, not the actual battery status)
If you do so once a month you should not have these issues.

If this does not solve, DeaconFrost is likely correct, and you may have some dead cells.