Satellite L850 - after 1 year of usage battery runs out quickly

Hi, through programs such as care or BatteryBar battery battery I see a Toshiba Satellite L850 *battery wear from 48%* currently. I notice that playing a game the battery runs out quickly, as the warm up by a lot, and often descalibra and behaves erratically.
The laptop is a year old. Is it normal for the battery to wear so much in so little time?
Would you accept a guarantee or battery replacement can claim wear caused by misuse?
http://img690.imageshack.us/img690/6976/4f7k.jpg

First of all you have to know that battery working time depends on the notebook usage.
Running heavy performance applications like a game would discharge the battery much quickly. Why? Because parts like GPU and CPU and cooling modules run at highest performance and this needs power.
Also using the notebook with highest display brightness would discharge the battery faster.
You should also know that every battery would start to loose own performance after about 500 charging cycles. This is nothing unusual and will happen to all batteries.
To avoid or to slow down this process, its recommended to calibrate the battery from time to time.
Calibrating means charging and discharging the battery fully.
Charge the battery until it would be fully charged, then disconnect the AC adaptor and keep the battery discharging until its fully empty. Repeat this procedure 2-3 times in the row.

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Satellite L850 - after 1 year of usage battery runs out quickly

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