Can you run a Thinkpad without battery?

Discussion in 'Lenovo' started by species5618w, Jun 19, 2012.

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  1. species5618w

    species5618w Notebook Consultant

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    Would that harm the machine?
     
  2. takeabyte

    takeabyte Notebook Evangelist

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    Yes, you can run it directly off the power adapter. This is actually better for the battery (so I've read, anyone feel free to correct me if I'm wrong) if you primarily use it while plugged in.
     
  3. nkull

    nkull Notebook Guru

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    Depending on the machine and use, you may run into performance issues --- With a ThinkPad there is no reason to take the battery out if you keep it docked / plugged in most of the time, but I would setup the power manager to optimize the charge settings for such use. My laptops are ALL setup to not start charging until they discharge to between 60 - 70% capacity, and they all stop charging at 90% --- This keeps the battery from being stuck at 100% with small charging cycles which is not good for it.

    I've generally seen that it is best to keep the battery IN regardless of use.
     
  4. bogatyr

    bogatyr Notebook Evangelist

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    Machine? No. Performance? Yes.

    If you want to protect the battery, setup the charge cycle as suggested above by using the Power Management tool that Lenovo provides. I would not suggest keeping the battery out of the laptop as it will lower performance (I think down to 800Mhz on the 20 series, i.e. T420, W520, etc).

    EDIT: More details on running without the battery and performance:
    http://forums.lenovo.com/t5/T400-T5...ow-only-if-battery-not-plugged-in/td-p/682859
     
  5. species5618w

    species5618w Notebook Consultant

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    Ah, thanks for the warning and the link. However, the performance issue seems to be associated with the 65W power adapter. I have the 90w adapter.
     
  6. nkull

    nkull Notebook Guru

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    Just keep in mind that these machines were built to run with the battery, and with the advanced features that allow you to configure the charging cycles on the battery I can think of no reason to remove it.
     
  7. power7

    power7 Notebook Evangelist

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    This probably varies depending on power adapter, machine, BIOS version etc. W520 with 170W does not throttle CPU w/o battery. And even if it did, ThrottleStop would fix the issue (170W is more than enough under any load anyway).

    There is certainly no harm in trying.
     
  8. Tsunade_Hime

    Tsunade_Hime such bacon. wow

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    Yes it will run, it can cause issues as I believe _60/61 series ThinkPads throttle down the CPU if a battery isn't installed, made my Z61t's T7200 downclock to like 800 MHz until I reinstalled the 7 cell battery.
     
  9. baii

    baii Sone

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    Is the "throttle" cause by a insufficient power adapter? "Build to run with battery" seem kind of silly to me though.
     
  10. talin

    talin Notebook Prophet

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    My T410 throttled without the battery. Then I simply got a 90 watt power supply and performance was back to full. :)
     
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