Battery Backup For Laptop When Power Outage?

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  1. Posts : 1,035
    Windows 10
    Thread Starter
       #41

    Hi there. The bios was not in the manual.


    It was in this one page that says important document


    Flashing the bios


    It says for best performance, its recommended to flash the bios of your laptop to latest versio.


    I didnt do that so i assume not big deal?


    I just connected the power charger to my laptop now and charging it.


    So the best thing to do now would be... charge it to 100%. Then unplug it. Then let it go on battery. And once battery is low, plug it in back again till it hit 100% or whatever it hit correct and rinse and repeat? So that way i can test how many times i can recharge it? But if it leave it plugged in the entire time like what you do, that doesn't discharge anymore power from it?
      My Computer


  2. Posts : 11,377
    Windows 10 Home x64 Version 21H2 Build 19044.1706
       #42

    If the Dell Drivers & downloads page for your Service Tag provides an updated BIOS then install it.

    About
    So the best thing to do now would be... charge it to 100%. Then unplug it. Then let it go on battery. And once battery is low, plug it in back again till it hit 100% or whatever it hit correct and rinse and repeat? So that way i can test how many times i can recharge it? But if it leave it plugged in the entire time like what you do, that doesn't discharge anymore power from it?
    You can keep removing it if you want to. I don't bother.

    Denis
      My Computer


  3. Posts : 1,035
    Windows 10
    Thread Starter
       #43

    Try3 said:
    If the Dell Drivers & downloads page for your Service Tag provides an updated BIOS then install it.

    About You can keep removing it if you want to. I don't bother.

    Denis
    I have seen the bios screen before and that freaked me out so i don't want to try it. Im pretty paranoid about that. Would you say its fine not to do it? Im just concerned something goes wrong on it.


    If you don't remove it, it still is taking power from the power bank though right? So basically if i wanted to... i can just leave it on the entire time? So i got a good question on this. So basically i can leave it on. Then do my own thing that i do when there is a power outage. Then i can basically test to see how long this power bank is going to give me in term so hours and minutes correct? Example no power outage right now. I connect to it and use it as i do for what i normally do. Then see how long it last for until i notice in the bottom right it no longer is charging and the percentage starts dropping?


    So when i normally use it when no power outage, just use the charger as normal as i would plugged in and don't use power charger. Then when a power outage happens, use the laptop on battery until it gets close to running out. Then plug it in. And basically just plug it in the entire time? Do you know if i could more power plugging it to 100 percent and then unplugging it and then using it on battery and then plugging it back in again and rinse and repeat? Of course there is good chance i could only recharge maybe only 2 times at the max? But maybe even more? So basically do a trial and error and see?


    The other thing is this. You say you have it connected always to your laptop. So you never use the charger then? However if you have it plugged in all the time, wouldn't that mean you are wasting charges on it similar to like a rechargeable battery because it can have so many cycles? Example a laptop battery last about 2 years before you should change it. But the laptop charger assuming there is no issues with it, it should last a very long time even 5 or more years right assuming there isn't anything wrong with it? If that is true, then aren't you wasting charges or cycles if that is the right term because after a while, you going to need a new power bank? Do power banks eventually wear out like rechargeable batteries where they no longer can recharge and you need a new one? And if so, you know how many charges or how many years? Because my thoughts would be only use it when power outage or necessary as in when you are outside but no electric outlet?
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  4. Posts : 1,035
    Windows 10
    Thread Starter
       #44

    And related question to this. Say there is a power outage. I then use it my laptop on battery for 1 hour. Then i connect the powerbank to my laptop and use it as i do normally. Then it hits 100 percent and i unplug the power bank. Because i have no electricity, there is no way i could see how many bars out of the 5 bars i have on the battery meter correct?


    Thus basically use it right now 2 ways to trial and error and test how long can get out of it?
      My Computer


  5. Posts : 1,035
    Windows 10
    Thread Starter
       #45

    I did a full charge and it seemed like it took 1 hour 30 minute to charge it to 100 percent. I then plug my laptop charger into the power charger and there are 2 lights showing. So that means i have basically less than 2 full charges on it right? I will say that when i was using the power charger charging... i was not doing much on it. Thus not the usual thing on it. So based on that, this probably last me 2 hours at the absolute max right? Because i wont get more than 2 full charges on it and also if i was doing the thing i normally do... i think it probably charges to 100 percent but thats all? So basically 2 hour max probably? Because if i charge it when basically doing nothing on it and it having 2 lights left... that mean i might not even get a full charge on it right when im done when using it?
      My Computer


  6. Posts : 11,377
    Windows 10 Home x64 Version 21H2 Build 19044.1706
       #46

    I do not know what each "it" refers to so I do not properly understand what you have written.

    If your powerbank shows two lights it means it is only partially charged.

    If you meant that you
    - fully charged the powerbank
    - then used the powerbank to recharge the computer's battery [from flat to 100%]
    - and you are now left with only 2/5 lights on the powerbank
    - then it does mean that you are only going to get 1 and a bit computer battery recharges out of each fully-charged powerbank.
    Last edited by Try3; 30 Mar 2019 at 07:47.
      My Computer


  7. Posts : 1,035
    Windows 10
    Thread Starter
       #47

    Hi there. Well when i was using the powercharger, i barely used the computer at all. So when a power outage does happen and i do my usual thing on it, wouldn't that mean i might not even get a full charge then if thats the case?


    Are you surprised that me charging it to 100%, that i only have 2 lights left on the powerbank? I was charging it at the 30 percent mark... not even when it was 10 percent or less...



    So basically my laptop uses so much power compared to yours right? I know this laptop is a quad core which does use a lot of power.
      My Computer


  8. Posts : 17,266
    Windows 11 Pro
       #48

    @paulyjustin,

    The specs for XPS 15 9550 shows that it comes with an 84Whr Lithium Ion Battery. Your powerbank shows that it is 65Whr. Therefore you can expect that the powerback will power the laptop for about 75% as long as the internal battery. You stated that you charged the internal battery from 30-100% and used 3/5 bars on the power bank. That would be about right. Don't expect to get 2 full battery charges of an 84Whr battery out of a powerbank that only has a 65Whr battery in it.

    The Whr rating of the battery is how long it will supply 1 watt of electricity. An 84Whr battery will supply 1 watt for 84 hours. The powerbank 65Whr rating means 1 watt for 65 hours. The reason you might get 1 full charge of the 84Whr battery out of a 65Whr powerbank is because there will still be some reserve energy left in the battery when the laptop calls it quits. The powerbank likely won't keep as much reserve in the battery as the laptop will.

    The whole international voltage consideration has to do with the voltage of the electrical outlet you can plug it into and has absolutely nothing to do with battery life. It also has nothing to do with the amount of time or energy required to charge the battery because the inlet AC voltage is converted to the same DC voltage in the power supply regardless of whether it is plugged into a 240v or 110v outlet.
      My Computer


  9. Posts : 1,035
    Windows 10
    Thread Starter
       #49

    hi man thanks for the response. the battery is actually 56w not 84w. I think there are different models of it. So how does the calculation work now? Is that better or worst than the 84w battery.
      My Computer


  10. Posts : 1,035
    Windows 10
    Thread Starter
       #50

    Also when charging it, i did not do much on the laptop, just light web browsing. So if doing anything intensive while is charging that might be just 1 charge right? So basically havinf this power bank give me 2 hrs to 2.5hrs so to speak? Example power goes out, use it on battery for 1 hr...plug it in and charge it to 100% maybe while ising it for 1.5 hrs. Then use it on battery for 45m to 1hr since it might not charge fully?
      My Computer


 

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