[Prime] INIU 18W USB-C PD & QC 3.0 20000mAh Power Bank $11.12 Delivered @ INIU Amazon AU

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Clear on 22/12/2023 - 00:01 amazon.com.au (2474 clicks)
Last edited 26/03/2024 - 07:27 by 1 other user

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Insane price on this 20000mAh power bank that has a USB-C port with 18W Power Delivery in/out, a single USB-A port with 18W Qualcomm Quick Charge and a single USB-A port with standard 15W charging. Perfectly fine for airline travel in carry on being 74Wh only and weighs 348g.

• Tick 50% off coupon under price
• Proceed to checkout to get final price

Price History at CamelCamelCamel.

This is part of Boxing Day Sales for 2023

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• 

  AdamFury on 22/12/2023 - 00:03

  Wicked price. Thanks Clear.

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  vbhlsd on 22/12/2023 - 00:03

  Nice one!

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  RichardL on 22/12/2023 - 00:04

  I doubt the price will last much longer.

  Double Stacking Boxing Day Sale + Checkbox Coupon.

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  A s h on 22/12/2023 - 00:04

  Got one, thanks Clear

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  0 0 0 on 22/12/2023 - 00:04

  Nice one thanks!

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  ce5himm on 22/12/2023 - 00:05

  36 now

  • 

    Turbonetics on 22/12/2023 - 00:06

    Yeah i see 36 too. All cheap ones claimed?

  • 

    MagicTsukai on 22/12/2023 - 00:06

    deal lasted 2 minutes. missed out :(

    • 

      Clear on 22/12/2023 - 00:06

      300 clicks in 5 minutes - I'm not surprised it went so quickly.

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  mynameisborat on 22/12/2023 - 00:06

  Can't see the coupon

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  Jimmyolo on 22/12/2023 - 00:06

  just missed it..

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  gherkins on 22/12/2023 - 00:06

  Expired

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  MDSUXKS on 22/12/2023 - 00:09

  Doesn't show up on my Amazon whyyyyyy?

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  OZKap on 22/12/2023 - 00:09

  Missed it by that much 🤏

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  LegitBox on 22/12/2023 - 00:09

  missed it by 2 minute…

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  GnarlyKnuckles on 22/12/2023 - 00:14

  +2

  Mmmmyeah, deal is gone now. I wonder how many other peeps (like me) just started a 'free Prime trial' to get this, only to find that the 'deal' lasted all of a few minutes … lol

  • 

    Clear on 22/12/2023 - 00:52

    With the low quantity Amazon post getting a dozen new deals a day combined with every other Amazon deal the price of Prime is really justified for me.

  • 

    Nom on 23/12/2023 - 17:55

    wonder how many other peeps (like me) just started a 'free Prime trial'

    I can't believe there's anyone else on OzBargain that doesn't already have Prime. It's an incredible deal 🤷🏼‍♂️

    Next time you need a $5 USB cable for example, it's just at your house the next day. Without Prime these sort of cheap items don't make sense to order because of the shipping - but with Prime, the access to the full Amazon market is worth the price alone.

• 

  beach bum on 22/12/2023 - 04:05

  -1

  Ge , these late night Amazon deals are just a tease .
  Now I know how the girl feels after the sexy times .

  • 

    John Dough on 22/12/2023 - 08:22

    You're doing it wrong.

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  Rumbaar on 22/12/2023 - 08:44

  Damn, lucky missed it. Would have purchased all they had, at that price. It's a good general gift or has so much usage options.

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  hamwhisperer on 22/12/2023 - 09:45

  That's a shame, missus needs one, if anyone spots more, let us know.

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  easternculture on 02/01/2024 - 16:50

  Anyone having issues with powerbank. Charges my S23U only 2 times lol

  • 

    Clear on 02/01/2024 - 17:28

    +1

    The S23U has a 5000mAh battery so let's do some calculations. True capacity:

    3.7V x 20000mAh / 5V = 14800mAh

    Well that should give you more than 2. Perhaps the efficiency rate is low and power loss high when converting 3.7V to 5V. Let's try 80% efficiency:

    3.7V x 20000mAh x 0.80 / 5V = 11840mAh

    Even that feels high. If we go for 70% efficiency we get 10360mAh and that feels more right. This obviously isn't 100% accurate as there's a lot of other factors but it does tell us they've cheaped out on the IC and PCB due to the <80% efficiency.

    Bigger brands like Xiaomi and Zyron have >90% efficiency and you'll squeeze more charges out of them.

    • 

      easternculture on 02/01/2024 - 17:38

      But i only charge my phone to 85%.

      Ill probably get my money back and invest in a known brand.

      • 

        Clear on 02/01/2024 - 17:50

        I did the calculations only at 5V. Not 9V or 12V that the fast charge would switch between.

      • 

        Nom on 02/01/2024 - 20:28

        What known brand powerbank is $11 ?

        • 

          easternculture on 02/01/2024 - 21:29

          @Nom: I still have my 2 X 20000mah 65w xiaomi i bought from kogan for $20 each

          Bought this as backup, but clearly quality is not there

          • 

            Prong on 03/01/2024 - 11:43

            @easternculture: Keep in mind those presale $20 ZMI QB823 power banks from Kogan were a crazy good deal, and the QB823 is an extremely high quality, high end power bank that otherwise mostly sold for above $100.

            The INIU B5 for $11 is also a great deal, but it's a completely different class of power bank.

            As or your actual issue, there are a lot of variables which could be affecting your results. A few tips. Don't believe the percentage display on the power bank, as they take time from new to self calibrate, and even then are not very accurate if using voltage to determine state of charge. It could be saying 0% and still have significant charge left. Draining it until it cuts out, the fully charging, and repeating a few times will help speed the calibration.

            Depending what voltage and current your S23U is charging at, the overall efficiency (in both the power bank and phone) may be quite low. The phone also uses power while on, which skews the result.

            Your best bet is to buy a USB capacity tester which can log the amount of power that flows through it. Otherwise you can approximate this using the phone.

            If you are interested, try the following.

            Fully charge the INIU B5, including leaving it plugged in for a few hours after it says 100%.
            Do a charge test overnight. (Phone off, or first note an average battery percentage drop on the phone over a specific number of hours, if not charging overnight)
            Charge with a USB-A to USB-C cable (to ensure slow charging)
            Note the percentage charged each night, minus the amount the phone normally uses for itself overnight (so whatever it starts at, to whatever it finishes at, minus its own use)
            Repeat this until the power bank won't charge anymore (not just when it says 0% - this is very important).
            Take the total percentage charged (EG, add each night together - 55%+ 67+ 33% and so on)
            Divide that percentage by 100, then multiple the result by 18.83Wh.
            Eg, 287% / 100 = 2.87 x 18.83 = 54.
            Divide that result by 74, then multiply it by 100.
            Eg, 54 / 74 = 7.3 x 100 = 73.
            That answer, is the percentage of the power banks battery that makes it into the phones battery. At slow charge rates, it should be around 75%, but +- 10% is not unexpected. The are some potential sources of error, such as using the phones battery percentage to track capacity change, but it should be relatively close.

            For completeness, do the above procedure more than once. And try it with your ZMI power banks as a comparison.

            If you get a low result (under 65%) then the may be an issue. If so, contact INIU support, since reports are they are quite responsive, and you have a 3 year warranty.

    • 

      Prong on 03/01/2024 - 11:14

      One extra thing - the S23U 5000 mAh rating isn't at 5V, so a an extra step is needed.

      Based on teardown videos, the rated capacity for the S23U battery is at 4855 mAh, at 3.88V. They helpfully give the Wh - 18.83Wh. (They also give a "typical" capacity - 5,000mAh, 19.4Wh.)

      The INIU B5 is 74Wh (20,000mAh at 3.7V). INIU don't provide a useable capacity rating, but certainly it won't be the most efficient.

      The other thing is that there is an efficiency loss on the Samsung end, for charging the battery. Part of that is lost in the battery itself, and part in any voltage conversion circuitry.

      I can't spot any analysis of the S23U charge efficiency. It may be quite low in certain circumstances, such as if doing high current fast charging. The INIU B5 does PPS so likely does 25W Samsung fast charging, but it's hard to know exactly what voltage is used. Interestingly the B5 does 4.5V at 5A, but I don't know if the S23U will use that.

      Lowish voltage, high amperage may mean efficiency for both the power bank and the phone are not the best. But that also depends on if it is actually fast charging in this case. The other wildcard is power use while being charged.

      Still, the overall efficiency for the power bank and phone combined would have to be very low (~50%) to only get two charges. But there are many unknown variables so hard to know if the power bank is performing correctly, or not.

      • 

        Clear on 03/01/2024 - 11:17

        Yeah you're right. I didn't want to type up a massive wall of text being completely technically correct. My calculations are good enough for a baseline to make people understand why a 20,000mAh power bank won't recharge a 5,000mAh phone 4 times fully.

        • 

          Prong on 03/01/2024 - 11:59

          @Clear: I ended up writing more than the "one extra thing" I had in mind which convoluted things.

          So the step I mean is the below, where you convert the power bank capacity to capacity at 5V.

          3.7V x 20000mAh / 5V = 14800mAh

          The S23U battery 5000 mAh is also at 3.7V. So to compare, you need to to convert them both to capacity at 5V, or neither.

          At 5V, the S23U capacity is ~3,700 mAh.

          So 3,700 mAh from 14,800mAh = 4 charges.
          Or 5000 mAh from 20,000mAh = 4 charges.

          Only converting one introduces a ~25% error. (in this case, in the power banks favour)
          5000mAh from 14800mAh = 3x charges.

          The best way is just to use Wh. (voltage x capacity)

          Both have a Wh rating available, so even easier as no conversions needed. 74Wh for the B5, vs 18.83Wh for the S23U.

          18.83 Wh from 74Wh = 4 charges.

          And as you note, you won't get 4 charges real world because of efficiency losses.