What kind of battery life does the latitiude e6400 get?

with a 9cell vs 6cell battery?

thanks!

 

With the IGP you can potentially get 5-6 from the 6-Cell, and 8-9 from the 9-Cell. Chop about an hour to an hour and a half off both for the NVS160M

 

really? my M4400 with 9 cell only gets 5 hours if i really really squeeze it, more like 4hrs on average with some power saving activated, or 3.5hrs with reasonable load.

 

Yeah, but a) M4400, b) T9600, c) FX 770, and espcially d) 2CCFL. My E6400 can do somewhere between four and a half and five under light use with a 6-cell.

 

yea but its a 4 hour difference :O i dint think it would be that big. even with the NVS160M, its still a 2 hr difference.

 

Well I mean just for the E6400 you add the Nvidia GPU and it takes off an hour... you add the extra screen-estate, a 35W CPU, a faster GPU, and then the dual backlights... say each item takes an hour off the battery and you have four hours right there.

In reality I'd say the FX 770 and the dual backlights take most of those four hours, though. The difference in overall power consumption between the T-Series and P-Series processors has been shown to be smaller than the 10W TDP difference would suggest.

 

any idea how many watts the FX770 is vs the NVS160M?

also, i found a dell page with the power consumption of the displays, i was kind of surprised that the 2CCFL screen took less than the RGBLED. Cant remember the figure though

but i reckon you're right, its probably the screen that does it.this thing really lights up the whole room!

 

http://www.nvidia.com/object/IO_11761.html#mobile
http://www.nvidia.com/object/quadro_nvs_notebook_techspecs.html

12W and 35W max for the NVS160M and the FX770! Obviously idle wattage is more important here, but sadly Nvidia doesn't want to tell us those figures.

I can say, though, that my E6400 pulls 13W from the outlet idling at the lowest brightness setting; discounting power supply inefficiencies that probably makes for a real idle power consumption of about 11W for the entire system.

 

thats interesting. i thought the thinkpad T400 had better battery life, but it seems that its about equal

 

The hardware is very similar (except Lenovo provide switchable GPUs) so the battery life becomes a matter of battery capacity and tweaks to disable un-needed hardware when running on battery.

For my E6400 (6 cell, P8600, LED backlit WXGA+ and Intel graphics) I reckon on 5 hours without tweaking and 6 hours with tweaking (provided in Dell ControlPoint). The 9 cell battery has 50% more capacity so should run 50% longer.

John