A moins d'avoir 2 bonnes batteries, je ne connais pas un PC de 15" qui tiendrait plus de 8h pour un budget de 500€...
Sinon :
http://www.materiel.net/ordinateur [...] 65462.html
The minimum battery life was measured by switching on the WLAN, maximum brightness and the high performance profile. With this configuration, the Acer TimelineX 5830TG ran a total of 2 hours and 21 minutes. The opposite of this test is usually the Reader’s Test, in which we try to measure the maximum battery life. The notebook manages to score very well in this test thanks to the big battery, and low power usage. The laptop ran for 12 hours and 7 minutes with this configuration. This impressive result sets a standard for other consumer notebooks.
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