So, I Tested The Outbax 100Ah Lifepo4 Battery Featured Here The Other Day

meatgasm on 06/04/2024 - 20:33
Last edited 06/04/2024 - 20:38

So I tested the 100Ah battery featured here on OZB: https://www.ozbargain.com.au/node/838693

The long and short of it: It tested at 107Ah. (bottom of below image)

🔋

Experiment

Setup

My setup was using an EBC-A20 battery tester to charge the battery to 13.6V. Charging the battery to 13.6V revealed that the battery needed 57Ah to fully charge up:

Charge Graph

After it was fully charged, I set the discharge current to 10A however, the EBC A20 only supports 85W Max discharge rate, so even though the discharge was set to constant current, more effectively it behaved like constant power. I set the discharge cutoff below the 10V BMS cutoff to see if the BMS would work and it did. Within 2 seconds of the battery voltage dipping below 10V, the internal BMS cut off the battery.

CSV Results

If you want a deep dive into the data, I have the CSV obtained from the software.
I cant upload Text on Ozbargain, and it exceeds pastebin's limit, so instead, download the following image,

Encoded CSV

Then use this tool: https://xcode.darkbyte.ru/

Upload the image you downloaded into there, click on "decode" and in a few seconds, it should print out the full CSV obtained from the charger.

Electrical & Electronics

Comments

  • bargaino on 06/04/2024 - 21:11
    +4

    Thanks! Always great to get test results on batteries. So many dodgy sellers, or supply chains.

  • rooster7777 on 06/04/2024 - 21:43
    +1

    I'm always a bit sus about lithiums with no weight stated (err… like the deal on this one you posted).
    Did you weight the critter?
    (for info on me whether sub say…12kg "100 ah" batteries can meet stated capacity)
    cheers

  • burningrage on 06/04/2024 - 22:43
    +3

    Plus one for effort OP.

  • GordonD on 07/04/2024 - 07:46
    +2

    You expect us to download something from darkbyte.ru, and run it on our computers to find out what the result was?

    Get serious.

    JUST TELL US FOR DOG'S SAKE!

    • Malik Nasser on 07/04/2024 - 09:52
      +2

      The long and short of it: It tested at 107Ah.

    • meatgasm on 07/04/2024 - 11:50
      +1

      Thats if you want the full CSV of the data.

    • bamzero on 08/04/2024 - 02:52
      +1

      Well it's just an online tool, only need to download the PNG from here.
      But I guess could have just saved us a few steps and just uploaded the CSV elsewhere.

      Midway through writing this I figured I might as well just do it..:)
      https://textbin.net/vhptjavwbw

      • meatgasm on 08/04/2024 - 20:40

        Cheers, thanks for a better alternative to pastebin for large texts.

  • shap08 on 08/04/2024 - 09:47

    ELI5?

  • stumo on 08/04/2024 - 14:08
    +1

    Thanks for posting you results OP. I plan to d othe same to the 200Ah version when it arrives.

    One thing though…

    My setup was using an EBC-A20 battery tester to charge the battery to 13.6V.

    Shouldn't you charge it to around 14.4V for a full charge? 13.6V is barely above the circa 13.4V resting voltage.

    • meatgasm on 08/04/2024 - 20:41

      The manual stated to charge it to 13.6V, so I followed the manual.

    • bamzero on 09/04/2024 - 00:38

      Somewhere out there is a YouTube I watched where he tested the difference charging to 14.4V or some lower voltage.

      Can't find it now but the takeaway was that it took a long time to finish to 14.4 and it was only the last few % so not a huge deal unless you really need every drop.

      • Prong on 09/04/2024 - 07:57

        Yeah at the 5A charge rate, 13.6V likely reached 95%+ capacity.

        They put in 777Wh (57Ah) from 13.2V (which is ~70% capacity). 10 hours of that to hit 13.6V, then another 4 hours of absorption like charge with current trending down. They may well have hit 98%+ charge.

        At the 0.67 C discharge rate (85W discharge), getting over the 100Ah rating is expected. So that extra capacity would also compensate for any slight under charge anyway.

        • Prong on 09/04/2024 - 21:32

          *0.067 C charge rate.

  • vodamerc on 09/04/2024 - 19:14

    Can anyone recommend a good deal on a charger - 5amps minimum?

  • diguinBR on 11/04/2024 - 10:32
    +1

    So at the end… is this a good thing for $230? Good enough to run camping fridges when you go out camping?

    • bamzero on 12/04/2024 - 12:17

      Yep

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