how much more battey life do u get with the 85Whr Lithium Ion Battery (9 cell)

how much more battey life do u get with the 85Whr Lithium Ion Battery (9 cell) compared to the 53Whr when gaming and at idle??

 

We'd need to know the specs, make, and model of the notebook you're referring to.

Notebook models can vary so very easily in battery life even with similar specs.

 

Agreed. However, in general, you can expect maybe 2.5hrs from a 6cell batter or 3.5-4hrs with a 9cell battery, if doing general productivity tasks, with WiFi on. Expect to halve that for gaming.

 

i can give you a percentage that should hold true regardless of what you are doing.

increase in battery life by 60.377358491%, give or take a percent or two.

we can just call it about a 60% increase in time.

so at idle if you had 4:00 hours, you now have a few minutes under 6:30. at load if you had 1:30, you now have a few minutes under 2:30.

but i don't know how long you have at idle or load with the original battery, so...

 

That's not necessarily true, because you don't know if the original battery had the same Whrs per cell. For example, in an HP you can get a high capacity 6cell, and upgrading from that to a 9cell wouldn't give you a 60% increase.

 

he listed the rated watt hours on each battery

 

Well, it sounds like the batteries he is talking about are from Dell, so I am guessing it is the 1520 or 1420 (1500 or 1400 vostro)
I have a 1400, and with the 9 cell I get around 4 1/2 hours surfing the internet and doing generally light stuff. (this is with a dedicated card)
The one time I gamed on the battery I got a little under two hours on it.