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A8Js battery specs

post #1 of 17
10/23/06 at 11:25pm
Thread Starter 
Hi all,

I'm just curious if somebody could tell me the specs on the A8Js battery/batteries as far as size and weight? Is there more than one option? Also, is this a model-specific battery or does Asus reuse battery designs for multiple models?

Thanks
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post #2 of 17
10/24/06 at 5:12am
Hi,

I think the A8js uses the same battery as the A8jm. In that case it would be a 6 cell batter, 4800mAh I believe. I think there is only one model of batter that fits the A8js. The battery should work for the entire A8j series. Im not sure about that size and weight...
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post #3 of 17
10/25/06 at 4:11am
Here's what Lavalys' Everest Ultimate Edition 2006 Trail Edition gives me on my A8JS battery (laptop bought in Taiwan) while it is charging -

Battery Properties: Device Name A8-3224 Manufacturer ASUSTEK Unique ID ASUSTEKA8-3224 Battery Type Rechargeable Li-Ion Designed Capacity 51260 mWh Fully Charged Capacity 46343 mWh Current Capacity 34375 mWh (74 %) Voltage 12298 mV Wear Level 9 % Power State AC Line, Charging Charge Rate 26851 mW

Hope that's what you want. Else I'll have to take it out and flip it over for the printed specs. Just ask.

ThomasL
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post #4 of 17
10/25/06 at 5:49am
i emailed portableone, and they told me that the battery life of the A8Js is slightly shorter than the A8Jm due to the extra voltage of the Core 2 Duo. my A8Jm gets around 3 hours of light use, if that helps at all.
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post #5 of 17
10/25/06 at 6:24am
Thats strange, because if you look up battery benchmarks between the Core 2 Duo and the Core Duo, the Core 2 Duo actually gets several minutes more battery life... Even though it uses more volts... I'll see if I can hunt down any benchmarks...
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post #6 of 17
10/25/06 at 2:52pm
Quote:
Originally Posted by sykozylot
i emailed portableone, and they told me that the battery life of the A8Js is slightly shorter than the A8Jm due to the extra voltage of the Core 2 Duo. my A8Jm gets around 3 hours of light use, if that helps at all.
I'd guess they mixed something up there. As the previous poster said, C2D are actually more energy efficient than CD. What makes it have less battery life is the slightly more powerful graphics card.
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post #7 of 17
10/25/06 at 9:42pm
Thread Starter 
Actually, the reason I was asking is because I'm becoming interested in the A8Js but I worry that the battery life isn't going to be good enough for my needs so I was wondering what sort of bulk I'd have to lug around with a second battery. All this other discussion on the battery life is interesting though so keep it up.
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post #8 of 17
10/26/06 at 10:47am
IF it's not enough power, grab a 2nd one. You will be carrying an extra pound though....
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post #9 of 17
10/26/06 at 5:25pm
Quote:
Originally Posted by asusreviews.com
Thats strange, because if you look up battery benchmarks between the Core 2 Duo and the Core Duo, the Core 2 Duo actually gets several minutes more battery life... Even though it uses more volts... I'll see if I can hunt down any benchmarks...


The A8Js has a more powerful GPU, probably contributing to the limited battery life.
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post #10 of 17
10/26/06 at 5:50pm
Quote:
Originally Posted by Seth13
The A8Js has a more powerful GPU, probably contributing to the limited battery life.
Reading is good...
Quote:
Originally Posted by Djembe
What makes it have less battery life is the slightly more powerful graphics card.
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post #11 of 17
10/27/06 at 7:59am
I had a look at my AJ8S battery: +11.1V with 4800mAH.

Generally, with Power4Gear set to 'Quiet Office' wherein my T5600 1.83GHz C2D is reduced to 987MHz, the battery lasts less than 2.5 hours, more like 2.25hrs...doing general stuff - web, office work, etc. But last night I started the stopwatch on it when booting in to do some video editing and compositing rendering work, and initially these did not seem to affect the battery much, if any. Then, towards the end, I switched to 'High Performance' (full 1.83GHz) and the battery drained quickly such that before the original 2 hours were up, I had to plug in the power.

In conclusion, I'd say both the CPU and GPU play their parts in affecting the battery life.

ThomasL
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post #12 of 17
11/28/06 at 11:13pm
Quote:
Originally Posted by Djembe
I'd guess they mixed something up there. As the previous poster said, C2D are actually more energy efficient than CD. What makes it have less battery life is the slightly more powerful graphics card.
I just read a review where a side by side comparison between core duo and core 2 duo was done. Core 2 duo uses 10% more power for a approximately 15% performance gain. I made the same assumption that they'must' use less power. No, they are more efficient, because you get very slightly more performance per watt, but they don't, i repeat they don't use less power. core duo 31wattsTDP vs core 2 duo 34wattsTDP Google it, if you want to find this test 'core duo vs core 2 duo'
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post #13 of 17
11/28/06 at 11:24pm
I too am very close to buying one of these machines, but if it weighs 5.37lbs for 2 hours battery life and you effectively have to buy a second battery and lug it around, bringing the weight up to 6.4lbs, well where is the gain in that? I might just as well get a 15.4" notebook with a 9 cell battery. I cannot comprehend why Asus have not provided a 9 cell battery, other than to give the impression that this is a lightweight mobile gaming system. Under 3 hours for a 14" notebook under normal load is embarrassing.
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post #14 of 17
11/28/06 at 11:36pm
Quote:
Originally Posted by richarddesmond
Under 3 hours for a 14" notebook under normal load is embarrassing.
It would be for a 14" with low end dedicated or integrated graphics...
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post #15 of 17
11/29/06 at 10:05pm
TDP does NOT have much to do with battery life.

Those values reflect the absolute maximum sustained power draw of the processor. It's short for "thermal dissipation power": how much heat per second the case needs to be able to get rid of at max load.

Processors do not use anywhere near that much power under nearly any circumstances. The thing that matters for battery life is consumption at idle (or near-idle), since processors spend almost all of their non-gaming time at the minimum P-state under light load.

As an example: My laptop has a processor rated at 62w TDP. The entire system, not just the processor, pulls 25w when web-surfing.

For battery life, you care about the power consumption of the bottom P-state, not the top one. While Merom may well use more power at idle/near-idle than Yonah, what you've just said doesn't prove it.


@ Sasha: I thought Nvidia was making a bunch of progress on shutting down unnecessary circuitry in high-end GPU's while not gaming to save on power? Does a 7700 really draw that much more power than a (say) 7300 while doodling in Notepad?
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post #16 of 17
11/29/06 at 10:33pm
Quote:
Originally Posted by Entropius
@ Sasha: I thought Nvidia was making a bunch of progress on shutting down unnecessary circuitry in high-end GPU's while not gaming to save on power? Does a 7700 really draw that much more power than a (say) 7300 while doodling in Notepad?
Sure, both nVidia and ATI have made huge progress over the last few years with mobile GPU's... but that's all reative to previous generation hardware. It wasn't long ago that the top GPU [or 2nd top] placed in a notebook would cause it to have 1hr or less battery life... To have around 2.5hrs on with a GF7700 512MB card running on only a 6cell battery with all of the other hardware... well, it's impressive to say the least. Keep in mind that some people have gotten their A8F's to run almost 4 hours long with battery saving mode... Point is, if you really want to get longer battery life from your future notebook, keep games on the desktop and get the more efficient notebook [with a low end gpu].

Although I also think it's BS that ASUS doesn't have a 9 cell for the A8Js...
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post #17 of 17
12/14/06 at 6:05pm
Quote:
Originally Posted by richarddesmond
I just read a review where a side by side comparison between core duo and core 2 duo was done. Core 2 duo uses 10% more power for a approximately 15% performance gain. I made the same assumption that they'must' use less power. No, they are more efficient, because you get very slightly more performance per watt, but they don't, i repeat they don't use less power.

core duo 31wattsTDP vs core 2 duo 34wattsTDP

Google it, if you want to find this test 'core duo vs core 2 duo'

Link the comparison please.

If both chips are being maxxed out to the limits of their TDP, then yes, the Core2 Duo will have a shorter battery life. If that is essentially how they performed their side-by-side comparison, then of course the core2 duo looks bad.
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