Laptop battery liftime from Dell specs?

Posted by user26535 on Super User See other posts from Super User or by user26535
Published on 2010-01-30T12:16:10Z Indexed on 2010/04/10 5:03 UTC
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dell

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battery

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battery-life

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lithum-ion

Question: When I buy a Dell Laptop, I get the following choice for battery:
(Lithium-Ion main battery with X cells and Y Wh [included in price/at additional $]

Lithium-Ionen-Hauptakku mit 4 Zellen und 24 Wh [Im Preis enthalten]

Lithium-Ionen-Hauptakku mit 9 Zellen und 85 Wh [zuzgl. CHF 120.01]

Lithium-Ionen-Hauptakku mit 6 Zellen und 46 Wh [zuzgl. CHF 30.00

I figured that I can calculate that a 86 Wh offers +254% of the 24 Wh lifetime, but...
Is there any way to calculate to what battery time this amounts in hours ?
I mean how many hours will the 24 Wh last (at normal operation - eg. writing a document - not watching video), else the +254% is a pretty useless number...
Also anybody knows whether 4 cells means 4 times 24 Wh, or 24 Wh in total?

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