LG A9 CordZero Vacuum Batteries

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  [Deactivated] on 02/02/2023 - 14:10

  How often did you swap batteries? Did you keep the spare one in the charger?

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  impoze on 02/02/2023 - 14:29

  didn't swap too often as it was usually only used a few minutes at a time.

  I also found this old comment from @ifreddo

  ifreddo on 24/06/2020 - 22:01
  I own one of these and they're great. The ease of use over a corded vacuum more than makes up for the small dust compartment.

  Just a word of warning: I've had 2 batteries go dead on me with this model. Both replaced under warranty. I've realised that keeping the second battery in the 2nd charge slot while only using the first battery may have led to it dying. So I now keep the 2nd battery in a storage cupboard and swap them over every few months to ensure both batteries get a workout.

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  mshanann on 02/02/2023 - 15:21

  I think you mean 25.55 volt rather than 2.5V

  If the battery is 2000mAH - I'd expect 7 x 18650 cells in 7s1p configuration

  If it is 3000mAH or higher, then you could have 14 x 18650 cells in 7s2p configuration

  Just because the voltage is reading at ~25 volt doesn't mean the cells are not shot.

  You could try and charge the batter to capacity, then do some type of independent load test on it, using something like https://www.aliexpress.com/item/3256804909652648.html

  If the capacity is really low, then you could disassemble the battery pack and try and determine if individual cell(s) are bad or too discharged. They are all likely spot welded in though - and the battery housing is typically very hard to get in to. You could check facebook marketplace for anyone advertising reclaimed 18650 cells or reconditioned batteries and tool repair that may have the equipment to test the battery for you. Cells themselves are cheap at about $3.

  • 

    impoze on 02/02/2023 - 17:20

    It was def 2.5v, not 25v
    Used two different multimeters as well

    • 

      mshanann on 03/02/2023 - 11:20

      Possibly packs were drained - normally though any half decent BMS will have over discharge protection.

      Given you have nothing to lose, and assuming you cannot get them to repair/replace for free, I'd split one open and then try and individually charge the cells inside.

    • 

      BrettBullock on 28/05/2023 - 09:29

      Mine as well 2.5v at the terminals however cracking the casing open and measuring the actual ends of the batteries it reads 26.5v .
      There's plenty of juice in the batteries but somewhere in the circuitry it is not allowing it through.
      I could understand dying batteries from constantly discharging them too fast then leaving them flat but this is something different ,
      This is a BMS issue.
      All these people buying new batteries from the manufacturer and their batteries are possibly fine just a circuit board issue. Anyways I'm going to change out all the cells anyways and I will get back to you all

      • 

        impoze on 28/05/2023 - 11:07

        Yeah I tried that but couldnt get it to run, theres a korean video on youtube that did it successfully though

        I've ended up buying a dyson

      • 

        Embaloo on 16/06/2023 - 14:19

        Any progress with this, Brett? Frustrating!

        As with many others, I've got a sigle light coming on when charging, which turns off after maybe 3-5 mins, never charges properly. Both supplied batteries are the same.

      • 

        edrift on 02/04/2024 - 16:32

        Did you end up getting it working?

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  Embaloo on 25/04/2023 - 13:24

  I am trying to troubleshoot this for my neighbour too
  Their batteries have 2018 on the label but the unit has been close to unused for ages, and very little use initially. Pretty frustrating.

  • 

    impoze on 25/04/2023 - 15:55

    I opened up the packs and tried to refresh some cells,

    Put it back together but still couldn't get it to run

    • 

      Embaloo on 17/06/2023 - 11:31

      Nice attempt, yeah saw a youtube video for the dyson rechargables which worked for that one. Frustrating its not working for these.

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  gr43m3 on 07/07/2023 - 17:47

  @impose, I have the same problem, both batteries are dead, at the same time

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  Tomoro on 15/02/2024 - 13:49

  Hi, mshanann, I found your post on the LG cord zero battery pricing conspiracy very helpful& I watched the Korean YouTube refit- I’m keen to try. Just wondering if you can help me find which battery in particular I can purchase to get the required/ safe parameters- amps, voltage.
  Thanks

  mshanann on 02/02/2023 - 15:21
  I think you mean 25.55 volt rather than 2.5V

  If the battery is 2000mAH - I'd expect 7 x 18650 cells in 7s1p configuration

  If it is 3000mAH or higher, then you could have 14 x 18650 cells in 7s2p configuration

  Just because the voltage is reading at ~25 volt doesn't mean the cells are not shot.

  You could try and charge the batter to capacity, then do some type of independent load test on it, using something like https://www.aliexpress.com/item/3256804909652648.html

  If the capacity is really low, then you could disassemble the battery pack and try and determine if individual cell(s) are bad or too discharged. They are all likely spot welded in though - and the battery housing is typically very hard to get in to. You could check facebook marketplace for anyone advertising reclaimed 18650 cells or reconditioned batteries and tool repair that may have the equipment to test the battery for you. Cells themselves are cheap at about $3.

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  Tomoro on 15/02/2024 - 13:55

  I had to post comment as I’m new and cannot message you ‘mshanann’ directly

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  Tomoro on 18/02/2024 - 17:32

  Hi, mshanann, I found your post on the LG cord zero battery pricing conspiracy very helpful& I watched the Korean YouTube refit- I’m keen to try. Just wondering if you can help me find which battery in particular I can purchase to get the required/ safe parameters- amps, voltage.
  Thanks

  mshanann on 02/02/2023 - 15:21
  I think you mean 25.55 volt rather than 2.5V

  If the battery is 2000mAH - I'd expect 7 x 18650 cells in 7s1p configuration

  If it is 3000mAH or higher, then you could have 14 x 18650 cells in 7s2p configuration

  Just because the voltage is reading at ~25 volt doesn't mean the cells are not shot.

  You could try and charge the batter to capacity, then do some type of independent load test on it, using something like https://www.aliexpress.com/item/3256804909652648.html

  If the capacity is really low, then you could disassemble the battery pack and try and determine if individual cell(s) are bad or too discharged. They are all likely spot welded in though - and the battery housing is typically very hard to get in to. You could check facebook marketplace for anyone advertising reclaimed 18650 cells or reconditioned batteries and tool repair that may have the equipment to test the battery for you. Cells themselves are cheap at about $3.

• 

  edrift on 01/04/2024 - 20:04

  Just found out my battery also died.
  I noticed it was flashing the led in the charging stand. The voltage is measuring 2.5v and it's impossible that I've drained it dead.

  I've torn down and replaced plenty of 18650 cells in other packs before and even invested in a spot welder.

  Problem is that if the bms is dead then I'm stuck.

  This LG battery looks like a pita to open up too.

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  edrift on 02/04/2024 - 16:29

  Ok so I checked YouTube and found the Korean video of the guy cutting open the battery.

  I used a Dremel with cutoff wheel to cut open the pack.

  At the terminals it was measuring 2.5vdc

  At the battery positive and negative it was about 27.5vdc.

  5 cells were about 4v each
  1 cell was lower at about 3.65v

  I decided to see if I could manually force a charge into the terminals by sending about 29vdc in. No luck.

  I decided to then disconnect and reconnect the negative terminal. Bad idea. This dropped the terminal voltage down to 0.6vdc

  Then I decided to manually balance the low cell but the terminals are still at 0.6v instead of 2.5v.
  I think the bms is dead or shut down.

  If you look at the pack there are 3 tiny holes in it. I suspected they were probing points and I was right. After opening the pack there are 3 empty pads there marked SDA GND SCL. Other than ground, no idea what the other two are for.

  [Img]https://files.ozbargain.com.au/upload/119657/111577/17120352992232610112732873712918.jpg[/img]