This was posted 8 months 10 days ago, and might be an out-dated deal.

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Charmast Power Bank Mini LED, 10000mAh USB C 20W PD & QC $20.34 + Delivery ($0 with Prime/ $39 Order) @ Charmast AU Amazon AU

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Charmast Power Bank Mini LED, 10000mAh USB C 20W PD & QC $20.34 + Delivery ($0 with Prime/ $39 Order) @ Charmast AU Amazon AUAffiliate
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Clear on 18/08/2023 - 18:21 amazon.com.au (3676 clicks)
Last edited 06/09/2023 - 11:30 by 1 other user
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This previously popular power bank is back on sale and while not the most cheapest price it beats the current deal and it's still really good value for a tad over $20. Given the small size it's perfect for a quick top up while travelling and easily fits in your pocket.

It has both a USB-A and USB-C port with 20W Power Delivery fast charging and 18W Qualcomm Quick Charge. For recharging it supports 18W fast charging and for input there's a USB-C, Micro USB and Lightning port.

There's a digital display for the battery capacity/fast charging status and supports low current mode for gadgets like earphones which can be enabled by pressing and holding the power button for 2 seconds.

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Electrical & Electronics 10000mAh Charmast Power Bank

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closed Comments

  • Grey 13 on 18/08/2023 - 18:55

    Hey not bad. Gonna replace my Xiaomi 20k mAh and/or my Baseus 20k mAh as a lighter phone charger. Wonder can I also use this as power source for my rear dashcam as well?

  • StickBug on 18/08/2023 - 19:03
    +1

    1 star reviews are very dubious about the claim of 10000mAh

    • Clear on 18/08/2023 - 19:08
      +18

      They're what I call clueless people and I wouldn't expect everyone to know this. Let's say your phone is 5000mAh and you recharge from 0%. You're not going to get 2 full charges from that. Why? 2 big reasons.

      The batteries inside are rated at 3.7V while the output required to charge your phone is measured at 5V. Therefore the power bank is converting 3.7V to 5V and the following calculation is used:

      5V Capacity = 3.7V * 10000mAh / 5V = 7400mAh

      The other big reason is the conversion loss during transfer. This could be as small as 2%, 5%, 10% or even as high as 20%. It all depends on the quality of the PCB used.

      So factoring this in the actual capacity could be less than 7400mAh when charging your device.

      • StickBug on 18/08/2023 - 19:10
        +5

        Seems to be even less than that according to the review

        -It used 85% to charge a 5000mAh battery,

        So it'd be closer to that 20%

        • Clear on 18/08/2023 - 19:15
          +5

          A more detailed 2 star reviewer worked out it to be 5643 mAh after conversion. Seems a teardown is needed.

          • rpalmer on 18/08/2023 - 20:50

            @Clear: I'm going on a trek soon where capacity to weight ratio is important. I was just about to jump on this deal when I saw your comments. Thanks for that.

            Would you to know of any decent power banks (min 10000mah) that would be of relative lightweight?

            • Thimble on 18/08/2023 - 21:42
              +2

              @rpalmer: Have a look at the NB10000 GEN2, i did some research recently and apparently it’s the best lightweight powerbank. It’s made of carbon fibre.

              • Alienzzz on 18/08/2023 - 22:52
                +1

                @Thimble: If you dont mind paying triole this for a light weight, fast charging power bank that will give at least 2 charges and lasts a very long time (i have had mine over a year now and still as good as day 1)
                Jackery power bank, my deal website and cotd website has it for $62
                It was well worth the investment as i have aroind 10 low to mid range pwoer banks dumped in a box for kids that i trialled and never touched again.
                Its the size of a standard mens wallet

            • StickBug on 18/08/2023 - 22:34
              +1

              @rpalmer: Usually you want to double what you're actually looking for because most listing advertise capacity rather than rated energy, capacity being 3.7V usually an rated being 5V.

              If you're looking for a 10000mAh you're actually looking for a 20000 one.

              Personally, I like the new Baseus Blade HD it's just too bad it's not stocked in Australia, I myself have ordered one to import for myself.

        • MadoxNet on 20/08/2023 - 14:20

          I don't have this particular one but 3 of their similar thicker ones and they're great for 1.5-2 charges of a Pixel 6 Pro. The other problem with some (or probably most) people is that charge while still using their phone…

      • [Deactivated] on 18/08/2023 - 20:59

        Unless your phone is also specs capacity at 3.7V :)

      • Stopback on 19/08/2023 - 09:03

        Can you explain why you can't just use laddas to make a cheap usb recharge device

      • OzBestDeal on 19/08/2023 - 09:05
        +1

        I agree with your 7400mah calculation.
        But isn't phone battery also rated on 3.7v.
        So it's balanced out with the mah on powerbank.

        The only major loss will be on the conversion efficiency.

        • Clear on 19/08/2023 - 09:07
          +1

          That would make sense if the USB ports charged at 3.7V. That's why I talked about conversion loss. It gets further complicated when you factor in fast charging.

          • OzBestDeal on 19/08/2023 - 09:11
            +1

            @Clear: Yes that's where conversion loss is.
            But in terms of battery capacity
            10,000mah powerbank battery is rated at 7400mah @5v
            5000mah phone battery also rated at 3700mah @5v

            So if there's no conversion loss, 10,000 mah battery can fill up 2x 5000mah phones

      • trapper on 19/08/2023 - 11:53

        The battery in your phone is also 3.7v though.

  • finger on 18/08/2023 - 19:16
    +2

    Mine died after 4 months with limited use.

    • Magicmannn on 18/08/2023 - 19:19

      did you replace it/refund it under warranty? how easy was it?

      • superforever on 18/08/2023 - 19:41

        Just chat with Amazon to refund it.

        • Magicmannn on 18/08/2023 - 19:42
          +1

          but I want to know what @finger did

      • finger on 18/08/2023 - 21:35
        +1

        Nah it cost me $16 I just threw it in the bin like numerous pieces I've bought off Amazon. I know the risk. If it's under $50 I just don't bother with refunds.

        • superforever on 19/08/2023 - 00:27

          I am wondering will they refund for people without prime?

          I have prime, in this case they will refund me and don't need to send it back.

    • Gdsamp on 18/08/2023 - 19:26

      Godspeed

  • GenerallyClumsy on 19/08/2023 - 08:31
    +1

    By the comments it looks like we need an output capacity test in Whrs.

  • trapper on 19/08/2023 - 11:54

    ‎13.31 x 10.01 x 1.73 cm; 210 Grams

    This seems a lot larger than what the pictures show

    • Grey 13 on 19/08/2023 - 17:08

      Because it is. Quite hefty as well.

  • SmoothCactus on 21/08/2023 - 18:20
    +4

    I say this in EVERY battery bank post.

    • You get what you pay for.
    • No cells exist anywhere on this planet that offer the advertised rating for most of these budget companies, because it's impossible to cut corners or have lower cost options WITHOUT LYING.
    • Most battery banks lie about their capacity, this is accounting for unit changes and conversion, energy loss/efficiency, etc.
      After testing nearly 100 of the most popular banks, every single budget battery has come short of their own ratings both in advertising AND INTERNALLY, meaning budget banks will have cells labeled at a particular rating, and fall short of that when actually tested. Because to get these prices they use relabeled/fake or degraded cells.

    For this, I had tested these a long time ago, it's closer to 4800mAh.

    The battery inside these are tiny. It's not only physically impossible to have 10k mAh in this size, it is economically impossible too.

    Physics won't allow it.
    Economics won't allow it.

    Spend some money and buy a good bank, that will last you a long time.

    • Kodazzle on 23/08/2023 - 11:07

      Do you have any reccomendations for 10k power banks? Looking to buy one, ideally one on the lighter side.

      • superforever on 23/08/2023 - 15:12
        +1

        Xiaomi?

        • billadm on 25/08/2023 - 23:12

          I've the Xiaomi one, they make several different types of the 10,000mAh battery bank also it depends on where you buy it because for example those for the Chinese market are different.
          But if the Xiaomi 10,000mAh battery bank is much bigger than this misleading one in this deal, it means that the one here is nowhere near 6,000mAh and people like it only because of its small sizes.

  • RichardL on 06/09/2023 - 11:30

    Available again: $36.99 - 45% off Coupon = $20.34

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