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[Prime] Charmast 10400mAh 18W USB C Power Bank with LED Display $14.99 Delivered @ Charmast via Amazon AU

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[Prime] Charmast 10400mAh 18W USB C Power Bank with LED Display $14.99 Delivered @ Charmast via Amazon AUAffiliate
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Hiphopopotamus on 16/09/2024 - 03:45 amazon.com.au (3648 clicks)
Last edited 29/09/2024 - 20:20
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Limited time deal Lightning Deal, all 5 colours are available at this price (black, blue, green, purple and white).

  • ⚡【10400mAh High Capacity】This power bank can charge your iPhone 11 2.3 times, iPhone 11 Pro 2.3 times, iPhone 11 Pro Max 2.1 times, Huawei P20 2.1 times etc. Enough capacity for daily use, journey or travelling etc.
  • ⚡【3 Output】3 iSmart 2.0 USB ports provide a powerful total current output of 5.6A. One bidirectional Type-C port and 2 USB output ports allows you to charge your multiple devices simultaneously.
  • ⚡【LED Digital Display】The slim portable charger built-in advanced smart digital display technology, power display accuracy is up to 100% which ensures you know the remaining power clearly.
  • ⚡【Type-C & Micro USB Dual Input】It supports 2 types input ports, you can choose any one of the Micro USB or Type-C ports to recharge the power bank itself. High-speed recharging in just 4.5 hours with a 3A charger or 6 hours with a 2A charger.
  • ⚡【Smart E 3.0 Charging Technology】All three ports adopted the Smart E 3.0 charging technology, automatically identify your devices and deliver its maximum efficiency. Smart E and VoltageBoost combine to deliver the fastest possible charge.

Price is now Prime exclusive.

Price History at C CamelCamelCamel.
Electrical & Electronics 10400mAh Charmast Power Bank

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closed Comments

  • mg_k on 16/09/2024 - 06:47
    +1

    Slower charging and more expensive than iniu when on sale. (https://www.ozbargain.com.au/node/860596)

    No deal.

    • Save 50 Cent on 16/09/2024 - 07:58
      -7

      Great.. now can you let us know when it is going to be at the price again? And how many will be available for that price?

      • mg_k on 16/09/2024 - 08:02
        +13

        Where's your ozbargain spirit?

        Here we don't buy inferior product at higher price period.

        • Save 50 Cent on 16/09/2024 - 12:24
          -1

          Sometimes you just got to get the best option available. This deal is better than nothing if someone needs a power bank today.

        • Charmoffensive on 16/09/2024 - 12:24
          +2

          @mg_k

          "I'm going on holiday and I need a suitcase".

          you: "Just HODL for a year or two until the best case is on special again."

          "What am I supposed to do in the meantime?"

          you: "Use all the old plastic Coles shopping bags you've been hoarding like a good OZBargainer".

    • bob19 on 11/10/2024 - 02:32

      Travel back in time and buy iniu

  • Dandaman21 on 16/09/2024 - 07:06
    +1

    If anyone has one and can verify the weight would be much appreciated. Looking for something lightweight for hiking.

    • youknow on 16/09/2024 - 07:31
      +4

      Listing says 8 ounces, which is about 227 grams.

    • ezzaf on 16/09/2024 - 09:11
      +1

      These are good for hiking: https://zyrontech.com.au/products/10000mah-power-bank-portab…

      Mine is 185gr on my scale.

      • SlinkyDemille on 16/09/2024 - 14:28

        I don't have this, but Amazon listing shows weight of this Charmast is 166g? Can anyone canfirm?
        https://www.ozbargain.com.au/node/866685

        Also this Veektomx one is 170g? Currently waiting for it to be under $20 again, but still seems like a good deal at this price.
        https://www.ozbargain.com.au/node/862998

        • Prong on 16/09/2024 - 19:06
          +1

          168 grams on my scale.

          However it's lighter than a quality option like the INIU B6 because testing shows it's actually a 7,500 mAh power bank. They just call it 10,000 mAh and figure no one will notice the difference. The cells also struggle to keep up with fast charging.

          The Veektomx model you linked does the exact same thing.

          • SlinkyDemille on 16/09/2024 - 22:49

            @Prong: Wow that's good to know. 7,500mAh would probably be enough for me, but definitely doesn't sit right that they deliberately lie about the capacity. Are there lighter 7,500 options? Every gram counts for ultralight hiking.
            In fact, what's your recommendation for a truly lightweight option? Just taking weight into account, I feel like two 5000mAh power banks would be lighter than the INIU B6 and can be distributed between people if traveling with others.

            • Prong on 17/09/2024 - 08:56
              +1

              @SlinkyDemille: Yeah it's frustrating and there's very little accountability for false claims. And few publications actually testing power banks well.

              The best lightweight option is a very interesting (and complex) question! (my favourite kind, so please excuse the wall of text below)

              The tricky thing is it's not just about the weight - but the efficiency of the power bank when outputting power, and calculating something like Wh per 100 grams to use to compare power banks. I will look into that with the data I have collected!

              The other thing is that it depends on what phone you are charging, as for example PPS charging can often be more efficient and mean that more of the power that makes it out of the power bank, actually gets added as capacity to your phones battery. There are also big efficiency differences depending on charge speed – both from the efficiency of the voltage conversion circuitry and the rated capacity of the cells, which is typically higher at lower load. Even things like different USB ports on a power bank have different efficiency, as well as different losses due to resistance in the connection.

              Generally speaking, larger capacity power banks are lighter for a given capacity. This is because it requires less than double the material to make a shell for a power bank with double the capacity. This effect is amplified for say carrying two 5,000 mAh power banks vs one 10,000 mAh power bank, because you also double up on the circuitry, connectors etc. (It's also worth noting that none of the mini 5,000 mAh power banks I have tested have very good efficiency at all).

              I presume that when hiking, a slow charge speed is not an issue. In which case it might be hard to beat an option like the Nitecore 21700 intelligent battery system. It's 5,000 mAh, very lightweight (battery: 76g, power bank attachment 10.8g) , and flexible usage with the addition of the light (12.8 grams). That said, I have not tested it myself, so can't speed to how efficient the power bank module voltage conversion efficiency is. It's only 5V 2A though, so slow charging. I will email Nitecore and see if I can get one for testing! Nightcore also appears to have a range of ultralight power banks designed for hiking.

              There are a few 10,000 mAh power banks around 190 grams, such as the Ugreen 30W 10,000 mAh (PB502) model.. (the weight spec on Amazon is incorrect). It supports PPS, so efficiency may be better. I am currently testing it, so will do a few extra tests to dig deeper.

              The VRURC T2055 20,000mAh power bank is also an interesting one. It's larger capacity than you might need, but has good efficiency (85%+) and is only 308 grams. So the usable Wh per 100 grams is excellent.

              Anyway, I will have a play with my power bank test result spreadsheet over the next few days and let you know what stands out!

              • SlinkyDemille on 17/09/2024 - 13:05

                @Prong: Over on the ultralight subreddit, the Nitecore NB10000 and NB20000 seem to be the most recommended options for their weight, but they also seem plagued with QC issues. That coupled with their price has put me off those specific options. The 21700 seems interesting though…
                Also good to know about the Ugreen and VRURC options.

                I'll definitely be following along for any new information you can find and provide!

              • SlinkyDemille on 17/09/2024 - 13:18

                @Prong: Also, somewhat related and an idea for your article—a number of my elderly relatives and their friends have started buying heated jackets which are powered by portable chargers. I assume weight and overheat protection would be important considerations, but it would be good to know if there is anything else to consider and what portable chargers are most recommended for this particular use case.

                • Prong on 19/09/2024 - 13:54
                  +1

                  @SlinkyDemille: Ahhhh yeah ok – I don't have much experience with Nitecore gear, and previous requests for power banks have gone unanswered.

                  Heated jackets is an interesting use case too. I presume most jackets don't have heat pads where the power bank is located. And the ones I see online (based on the spec) have use a max of 10W of so when heating. So I don't think heat will be a worry, as long as the power bank is not directly next to a heat pad.

                  The power bank control circuitry typically has overheat protection. But for most power banks (at lower wattages anyway) it will never engage. So it's not something I have tested in terms of external heat – though I have a USB heat pad, so will devise an experiment to check.

                  But overall I think for heated clothing use, size and weight will be the main factor. The INIU B6 is likely ideal, as the quality is excellent, and it's not overly heavy for the capacity, has good efficiency, and is relatively slim. That said, if the jackets use a normal USB port, then the INIU B41 is slightly slimmer and lighter. (It has no fast charging, which doesn't matter in this case)

                  In theory a power bank that uses cylindrical cells (rather than pouch cells like the INIU B6 and other flat power banks) is slightly safer, as the cells are typically more stable. The Limeta EB40 would be ideal, as it (likely) uses Samsung cells. It has been discounted before but is currently more expensive. The EB40 is cool because you can monitor the remaining charge via smartphone app over bluetooth – which I imagine would be handy for when its in use but tucked away.

                  I will definitely look into adding some info to my buyers guide – thanks for the input!

      • Prong on 16/09/2024 - 19:12

        FYI, from my testing this Zyron models appears to use 7,500 mAh worth of cells, not 10,000 mAh.

    • Prong on 16/09/2024 - 19:09
      +1

      Mine weighs in at 168 grams. FYI though this is a relatively low quality 7,500 mAh power bank, not 10,000 mAh.

      I highly recommend the quality INIU B6 from this deal instead. It is 30 grams heavier and slightly larger, but has quality cells that can actually handle fast charging.

    • Lukian on 02/10/2024 - 02:17

      The number 2 best seller on amazon is 170g ($20.98) - Veektomx 10000mAh
      Excellent efficiency of the internal battery cell too. 169g on my scales at home.

      I slapped it in a personal copy of the Hiking Powerbank Spreadsheet (2022)
      It's in the "Medium" sheet tab.

      Given the outrageous cost of the Nitecore NB10000, it's the next best thing and only 19g extra.

      • Prong on 03/10/2024 - 14:02

        Out of interest, how are you measuring the Wh output to calculate the 96% efficiency?

        I have tested a few of the VT103, and based on capacity after efficiency losses (at 5V 2A), the best would rank 22nd, at worst one would rank at 51 on that spreadsheet.

        Sure, it's a compact, lightweight power bank, but it doesn't squeeze 10,000 mAh of capacity into a small space using high capacity cells. It just uses ~7,500 mAh cells and says the capacity is 10,000 mAh.

        For real world use the wh/kg is similar to a quality power bank like the Iniu B6.
        I don't think the VT103 cells are great quality though. I have a heavily used Iniu B6 that is only showing mild wear and capacity loss, whereas the VT103 cells have significantly degraded just sitting around at 60% charge.

        I don't have anything published for the VT103, but this Dr Gough review gets 72% efficiency – albiet at 5V 3A.
        https://goughlui.com/2023/08/31/quick-review-teardown-veekto…

        • Lukian on 03/10/2024 - 16:10

          I calculated it against charging my phone. I don't have a fancy USB meter (yet). There could be a 3% margin of error, but I repeated the test multiple times.

          Output mAh (at 5V) / internal cell voltage * output voltage / claimed capacity (of internal 3.7v cell)
          7137/3.7*5/10000 = 96.44%

          Edit: I see it has a 3.85v internal cell, so make that ~92-93% efficiency. Spreadsheet updated.
          Gough Lui measures efficiency in a different way.

          • Prong on 03/10/2024 - 18:34

            @Lukian: Ahhh. So you need to convert both mAh capacities into Wh to compare them. Wh = Ah x V.

            The phone records the mAh the battery voltage, rather than 5V. You'd need an app that logs the current and voltage through the charge cycle to get an accurate measure of the Wh.

            For a rough estimate, you can use 3.7V.

            So 7.137Ah x 3.7V = 26.4Wh into the phone.

            The power bank Wh is 10Ah x 3.85V = 38.5Wh.

            So the power bank outputs ~68.8% of the rated 38.5Wh capacity.

            This includes some efficiency losses in the phone, so your result is quite similar to what Dr Gough got, and what the best of the VT103 power banks I tested got.

            As a comparison, the INIU B6 provides about 28% more usable capacity, for about 23% more weight.

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