ROMOSS 60000mAh Power Bank $84.99 (was $99.99) Delivered @ Romoss Amazon AU

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SuperScope on 13/08/2021 - 08:19 amazon.com.au (3412 clicks)
Last edited 13/08/2021 - 08:21

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$15.00 coupon is available. Just make sure you apply the coupon before you add it to your cart. The discount will be applied at checkout.

Looks like the coupon became available after highon2str found it but kudos to them for finding one of the biggest powerbanks I've seen!

I don't think you can take these on planes though.

ROMOSS 60000mAh Power Bank, 22.5W Max Portable Charger Phone Battery Charger with 4 Outputs and 3 Inputs Fast Charge External Battery Pack for iPhone, iPad and More (Fast Charging not Suitable for Samsung)

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  smartazz104 on 13/08/2021 - 11:08

  +1

  I'll wait for the 100k version.

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  shane2770 on 13/08/2021 - 11:16

  Thanks grabbed 1

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  5thQuarter on 13/08/2021 - 11:37

  I have an Nvida Jetson Nano, which I currently powered via a 5V4A 2.1mm barrel pack.

  Given this Powerbank supplies 5V/4.5A on the USB Fast Charge port. Could I get a USB to 2.1mm Cable (like this one https://core-electronics.com.au/usb-to-2-1mm-male-barrel-jac…), and power a Jetson via this Power Brick?

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    stirlo on 13/08/2021 - 12:09

    +1

    The issue would be the 5V 4.5A is normally negotiated with the device being charged. If you just connect a barrel jack it won't have the chip to negotiate the higher charging rate and will probably be limited to 500mA (USB 1.0/2.0 spec).

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      eug on 13/08/2021 - 13:10

      If you just connect a barrel jack it won't have the chip to negotiate the higher charging rate and will probably be limited to 500mA (USB 1.0/2.0 spec).

      Hmm… just a guess, but I think there's a good chance it would work. The USB BC spec specifies three types of ports - SDP, DCP, CDP. The one you mention is a classic SDP (Standard Downstream Port) which starts at 100mA but negotiable over USB up to 500mA. The port on this power bank is most likely a DCP (Dedicated Charging Port) which performs no USB negotiation, but has a controller like the FP6601Q to handle QC negotiation.

      Because 5V is the default voltage and is the voltage that OP wants, no negotiation has to occur. The question is whether or not there's a current limit below the rated 4.5A on the port without QC negotiation. I'd wager that there isn't, as there isn't much point to it.

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        stirlo on 13/08/2021 - 13:17

        I'd wager that there isn't, as there isn't much point to it.

        What about for USB 1.0 & 2.0 rated devices that might be connected? Sending them 4.5A when they expect 0.5A could be an issue?

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          eug on 13/08/2021 - 13:23

          @stirlo:

          What about for USB 1.0 & 2.0 rated devices that might be connected? Sending them 4.5A when they expect 0.5A could be an issue?

          Fortunately no, as devices only draw what they need. For example, an 18W phone charger only needs 0.08A at 230V. The power socket on your wall can supply up to 16-20A before the breaker trips. There is no issue connecting a 20A power supply to a 0.08A device it as it'll just take what it needs.

          Voltage is a different story however - sending 12V into a device that's designed for 5V would cause damage.

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        5thQuarter on 13/08/2021 - 14:59

        This was my assumption as well, but I wasn't sure. I've seen a lot of powerbanks that offer 5V3A, but never 4A which is why I wondered. I may take the punt on it….Unless anyone knows a similar battery bank that can output 5V4A?

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  PlaunsJanus on 13/08/2021 - 12:26

  +1

  My Romoss 20000mah wont charge anything and has been sitting at full charge since it stopped working :( I think its something wrong with the fast charge sensing function.

  2 years old, very light use

  10000mah no fast charge still going strong!

  Used to be great. I wish I could fix it. I dont think I'd buy another Romoss product unfortunately

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  Just Invest on 13/08/2021 - 15:01

  +1

  I can use this as a Car dash cam overnight power source !!!! Thanks OP.

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    shane2770 on 13/08/2021 - 15:02

    +1

    Yeah I use the black 40k ones for many things powering via USB now extra 20k in the 60

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  HappyBargainer on 13/08/2021 - 15:55

  I really hope that Romoss can make 65W 60000 version.

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    plague69 on 13/08/2021 - 23:28

    Thin for that you have to build your own lol. Why not buy one of the LifePO4 12v 25Ah batteries from eBay and hook up a car charger to it? Futureproof because upgradeable.

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  Windy2 on 13/08/2021 - 18:49

  If I was able to charge the power bank at “work” how many charges would I need to offset the cost of the power bank?

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    ihbh on 13/08/2021 - 21:19

    +1

    Quick guess - you won't be able to get your RO(f)I by the time you're dead.

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    eug on 13/08/2021 - 21:43

    +1

    If I was able to charge the power bank at “work” how many charges would I need to offset the cost of the power bank?

    60,000mAh at 3.7V is 222Wh. If we assume a boost converter efficiency of 20%, you'll get about 177Wh (0.177kWh) out of a fully-charged pack.

    If your home electricity costs 22c/kWh, each fully-charged pack will save you 22*.177 = 3.894 cents. I'll ignore the mains charger conversion efficiency as it should be pretty high (~90%).

    So at a cost of $84.99, you'll need to charge this power bank 2,182.6 times at work to offset the cost of it. That's not taking into account cell degradation at such high cycle counts, so lets say 3,000 to be safe.

    If you recharge it once a day seven days a week, that'll take you about 8.2 years. Probably not the best way to save money. :)

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      plague69 on 13/08/2021 - 23:27

      Not all boards are made the same. Efficiency ~= temp while charging

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        eug on 13/08/2021 - 23:46

        Not all boards are made the same. Efficiency ~= temp while charging

        Yes, the efficiency depends on the design and the load. From one of my old tests, the efficiency I saw ranged from 83% (2A discharge) to 91% (1A). That is why I used an assumed figure of 80%. I actually mistyped that above - I meant 20% loss, i.e. boost converter efficiency of 80%.

        The whole thing isn't a serious calculation so there will of course be a margin of error. But it'd be in the ballpark.

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  Panpanw on 13/08/2021 - 20:42

  On Plane limited is 100Wh…
  This brick is (60000/1000)* 3/7 = 222Wh?

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    plague69 on 13/08/2021 - 23:26

    Yes, this one is over limit. 27000mAh is max, that's why you see so many of them around. (aka. 100 watt hours/ = Nominal voltage * Ah)

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    bargainshooter on 17/08/2021 - 06:56

    160wh is the max permitted on flights but you need an airline exemption letter

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  LoserScott on 13/08/2021 - 21:41

  How long will it take til a raspberry pi 4 dies on full charge?

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