Laptop Battery: 4 cell-48 Wh vs. 4-cell-70Wh

Feb 22, 2018
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I'm planning to buy a laptop ,but I don't know anything about batteries.

So,
Which is better? 4-cell 48 Wh or a 4-cell 70 Wh?

Mainly,what is the difference between 48Wh and 70 Wh and what impact does it have on battery life ?
Is that important only to overall baterry life, before replacement with a new battery, or - for one cycle of battery life (for example : one will last 4 hours ,the other will last 5 hours) ?
 
Solution
Well let's say it uses 8 watts per hour, then a 48 Watt/hour battery would last about 6 hours. A 70 Watt/hour battery would last 8.75 hours, or 1.45 times as long or 45% longer, however you want to do the math. lol.

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