Comments on: HP tc4400 Tablet PC: exceptional battery life or funny math?

By: Agnes

Agnes — Thu, 26 Mar 2009 10:20:59 +0000

I have tc4400 too, and I get approximately 2,5-3 hours at normal usage. However the software checking the battery is somewhat funny, because it says 1hour 55min battery runtime, but I can make notes for almost 3 hours continuously using Xournal with bluetooth off and screen brightness at maximum.

By: sweetaj

sweetaj — Tue, 06 May 2008 22:23:01 +0000

I have a tc4400, 2.0ghz core2, 3gb ram, etc. Normal use for me at the lowest screen settings is about 2.5-3 hours with the battery only being a few months old. Even out of the box with wifi off and brightness down I only got 3.5 if i was lucky. If you need to use it all day without plugging in it looks like you’ll need 2 extended batteries to add to the standard.

By: sweetaj

sweetaj — Tue, 06 May 2008 22:21:05 +0000

By: mark

mark — Thu, 14 Dec 2006 14:22:00 +0000

Even with screen brightness at minimum and WiFi off, I’m getting 3-4 hours max. And I squint a lot while working.

By: Raul Ybarra

Raul Ybarra — Fri, 19 May 2006 21:17:04 +0000

Got to tell you, I have a tc4200 and if I have the wi-fi off, regular business use gets me a good 5 hours of battery time. When I add the travel battery I’m looking at at… Well, actually, I can’t answer that because I’ve never gone short on power.

With wi-fi on, I’m looking at more like 2 1/2-3 hours. With the extended battery I’ve gone 4+ regularly(again, I’ve never had to push its limit).

My power settings are not very battery friendly- usually Away On, Light sensor off, and a lot of hard disk usage in signal processing. So my times are quite a bit less than a well optimized system would be.

The travel battery does add a pound of weight and I use it mostly when I’ll be in landscape or laptop modes.

By: Ansin Ozturkmen

Ansin Ozturkmen — Sat, 13 May 2006 11:20:10 +0000

Are you sure it is not on the ultra-capacity battery?

And this is dual-core.

By: Colin Taylor

Colin Taylor — Fri, 12 May 2006 15:09:29 +0000

Not exactly apples to apples but HP also promised approximately the same battery life on the previous TC4200 model. Much to my surprise, when I received my TC4200, the battery life is actually quite close to their projections. I regularly get 4:45 to 5:10 on the bundled battery with the automatic brightness option set and wi-fi TURNED ON! Has actually been one of the greatest surprises of any laptop/tablet I’ve ever used.

By: Ansin Ozturkmen

Ansin Ozturkmen — Fri, 12 May 2006 04:17:36 +0000

They are telling right. If you shut down one core, underclock the other core to 600 mhz, set the brightness to %10, don’t run wifi and bluetooth. While watching the notebook and ask yourself “what the hell i’ve done!”, you will see 10 wh on idle.

By: Mark Sumimoto (Sumocat)

Mark Sumimoto (Sumocat) — Thu, 11 May 2006 10:39:15 +0000

Wait, if I forget the math, then how do I add those 2 lbs? ;P

By: jk

jk — Thu, 11 May 2006 10:04:57 +0000

Forget the math, a 12 cell battery will add at least 2 pounds to a 4.5 pound device. That is entering Gateway territory. :)