How to Measure True Laptop Battery Output?

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • TractorGear
    Member
    • Mar 2015
    • 40
    • USA

    #1

    How to Measure True Laptop Battery Output?

    We just bought a new battery for my wife's laptop. The standard, OEM battery was a 6-cell and on eBay I found a 12-cell battery that claimed 10,500 mAh (I think that's the number) for $20.00. One of those "If it sounds too good to be true..." type of moments. I confess. I was weak. I paid that $20.00 and bought that cheap battery hoping to get something for nothing.

    Anyways it showed up incredibly fast (2 days, priority mail, which I didn't ask for or pay for) and it fits perfectly. Super large it causes the laptop to slant forward now because it's almost twice as thick as the previous, factory battery.

    So far I've done 2 full, 100% charge, @ 3% discharge cycles (until the computer just switches off) and now I realize I have no objective way to measure how many hours of "life" the laptop gets, due to all the various power savings mechanisms involved (screen turning off, hard drive turning off, hibernate, standby, etc...)

    Other than manually turning everything ON and making a big deal about force-testing battery A, comparing it to battery B, etc... is there an easy way to get a good, workable idea of how much "life" each battery gives? I want to say "This battery is good for 4 hours, and this one is good for 8 hours." or something along those lines.

    Is there a downloadable, freeware utility that "tracks" power consumption and battery life? It's Win7, so a "gadget" would be ideal.
  • kc8adu
    Super Moderator
    • Nov 2003
    • 8832
    • U.S.A!

    #2
    Re: How to Measure True Laptop Battery Output?

    http://www.nirsoft.net/utils/battery...tion_view.html

    Comment

    • domas
      News Hater
      • May 2013
      • 323
      • Denmark

      #3
      Re: How to Measure True Laptop Battery Output?

      this is my favorite
      w7 gadget

      http://addgadgets.com/battery_meter/

      Comment

      Related Topics

      Collapse

      • sam_sam_sam
        NTE Electronics “NTE5251K” Zener Diode 9.1V @ 50W Do-5.5% Want to build a 9.1 output from a 9.6 lipo4 battery pack
        by sam_sam_sam
        I have bought this Zener Diode for this project what size and wattage resistor value do I need to use to get near 50 watt output
        I bought this from an eBay seller but unfortunately they only had one

        I bought three from Vetco Electronics these are Sylvania ECG5185A 9.1@10w A to Stud what size and watt resistor do I need to use to get near 10 watt output
        I bought three of from them to also make battery packs with this output power limit in mind

        I want to use this battery pack and turn it into a 9.1 output battery pack output to eliminate using 9 volt battery...
        04-23-2025, 05:50 AM
      • ahmarzo
        Acer TMX314-51 laptop battery problem
        by ahmarzo
        I have acer laptop tmx314-51 with part no 6050A3020501.
        The laptop is working fine on adapter and battery is also charging and when adapter is disconnected in on state the laptop gives backup on battery and gives good backup.
        But when laptop is powered on through battery only the laptop does not power on and there is 0 voltage on battery connector.
        I have not not tried another battery as it is not available locally could this be a battery problem.have checked discharging mosfet and there is no shorting to ground on any pin of battery connector.
        The schematic is not available...
        04-11-2025, 09:14 AM
      • Document Archive
        ISL88739AHRZ ISL88739 Laptop Battery Charger Datasheet
        by Document Archive
        The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
        configurable for operating as either a Hybrid Power Boost (HPB)
        charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
        4-cell batteries. Both configurations allow the battery to work with
        the adapter together to supply the system load when it exceeds
        the adapter capability, referred to as system Turbo mode. HPB
        charger configuration reverse-boosts battery energy to the system
        bus to help the adapter provide the system power in Turbo mode.
        NVDC charger configuration...
        11-05-2024, 03:28 PM
      • doboka98
        Satellite C55-A-142 Laptop boots only without battery
        by doboka98
        Hello! I am fixing a Toshiba Satellite C55-A-142 (model no PSCG8E).

        It came with an old battery. Laptop was rebooting every 5 sec with black screen, not even entering BIOS. If battery was removed it worked perfectly only on charger. I thought it's a shorted battery so I ordered a new one.
        Now with the new one it wont even reboot, but the red battery light is blinking on the laptop. Pressing the power button does nothing. Laptop still works with battery removed.

        So to summarize:
        1. there is no short
        2. Laptop starts only with battery disconnected....
        10-26-2023, 07:09 AM
      • Document Archive
        Texas Instruments bq24745 bq24745RHDR bq24745RHDT Battery Charger IC for Laptop Computers Datasheet
        by Document Archive
        The bq24745 bq24745RHDR bq24745RHDT is a high-efficiency, synchronous battery charger with an integrated input-current comparator, offering low component count for space-constrained, multi-chemistry battery-charging applications. The input-current, charge-current, and charge-voltage DACs allow very high regulation accuracies that can be easily programmed by the system power-management microcontroller using the SMBus interface. The bq24745 charges two, three, or four series Li+ cells, and is available in a 28-pin, 5-mm x 5 mm QFN package.

        The bq24745 features dynamic power management...
        10-23-2024, 02:50 AM
      • Loading...
      • No more items.
      Working...