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How can you rate a battery? You tell everybody that it lasts 4.5 hours or you tell them that it weighs about 2 kgs? Anyway it is cool to buy it, either if your old one is dead either if you want an other source to change the main one with in case the main one is discharged. But still, I recomend an external battery, it's like a UPS and can be connected via the laptop's power plug, it won't last so much as this one but it's use is more comfortable.