Gaming notebook battery / power consumption

Discussion in 'Hardware Components and Aftermarket Upgrades' started by Razyre, Jan 22, 2014.

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  1. Razyre

    Razyre Notebook Evangelist

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    Hi there.

    I was interested to know how a laptop with dual GPUs such as the Alienware M18X lasts on battery.

    Not, how long is its battery life, but rather what current does it draw at its given voltage. I find it pretty crazy that such a high current drawing device can operate off of such a small battery.

    Could you link me to a li-on battery equivelant?

    I'm intrigued.

    Thanks.
     
  2. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    It will depend of the usage. At idle, full power (while gaming, for example) or torture testing with unrealistic loads like benchmarks (Intel Burn, for example).

    The current is P=IxE

    Where P = Power in Watts
    Where I = Current in Amperes
    Where E = Voltage

    So, download HWMonitor and see how much power is being used in the usage you're wondering about and divide that by the rated voltage of the battery. That will be your amperage.


    As of the '... can operate off of such a small battery' the reality is it doesn't really (unless mere minutes (at full tilt) are termed 'operating' for you).

    For the sake of argument; if the power needs are 100W (while gaming) and we have a 14.8V battery the amperage is ~6.75A. When idling, and the power is (estimated) at closer to 20W with the same battery the amperage is ~1.35A.

    (Adjust the above power needs to match the actual reported in HWMonitor and divide by the actual battery voltage rating too). (Also, the type of battery will depend on the workload it is normally driving. Is the original battery Li-Ion too)?

    Hope this helps.
     
  3. Razyre

    Razyre Notebook Evangelist

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    Well the point is with something like an Alienware M18x you have a battery that can provide power to two GPUs and a CPU at load when playing a game. I'm not sure what figures I'm looking at for a system like that but when you look at external laptop batteries or whatever they cost around 4x as much as an internal battery for a notebook like that and yet can only give you something like 3A at 19V or 4A at 12.
     
  4. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    That is irrelevant. :)

    That is why I stated 'Also, the type of battery will depend on the workload it is normally driving.'.

    The specifications of the battery pack will therefore be matched to the workload, of course.

    Doesn't matter what the 'wrong' batteries cost - they won't work in that configuration (with my assumptions above).


    Also; most high-end gaming notebooks dramatically throttle the performance (and the necessary power requirements) while on battery power (The MSI Dragon even throttles performance when plugged in and the battery level falls below a certain level: the power adaptor is simply insufficient to power the system fully by itself).

    This throttling on battery power may be to keep within the batteries spec's (but that just means they're using the wrong battery anyway at this point).
     
  5. Razyre

    Razyre Notebook Evangelist

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    Fair enough :)

    Thanks for your help.
     
  6. HTWingNut

    HTWingNut Potato

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    You cannot game on battery with the M18x. It is there solely as a stop-gap until you find another outlet. You will run the GPU's at lowest power setting for basic tasks.
     
  7. Tsunade_Hime

    Tsunade_Hime such bacon. wow

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    My M17x R2 throttled so bad if the AC adapter got unplugged, the CPU/GPU, everything went into lag mode, and I had to restart my laptop if it got unplugged. Such a beast should not be run on battery. They throttle the CPU/GPU so the battery doesn't explode trying to power all the power hungry components.
     
  8. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    Tsunade_Hime,

    Wondering how much power the system uses while gaming? Was my 100W assumption close, or is 150W or 200W closer when gaming?
     
  9. Tsunade_Hime

    Tsunade_Hime such bacon. wow

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    I never used a Killawatt, but if you break down individual components: 920XM 55W TDP, 5870M Crossfire is 120W according to Notebook check, SSDs, RAM screen, all the rest of the stuff plugged into my laptop. That and my R2 shipped out with a 240W PSU.
     
  10. tilleroftheearth

    tilleroftheearth Wisdom listens quietly...

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    Tsunade_Hime,

    Thanks; the 240W PSU says it all (even at 80% efficiency; 192W). :) wow!
     
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